How do I find the mean and standard deviation from a frequency table?

How do I find the mean and standard deviation from a frequency table?
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Do you have a graphing calculator?
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Description : What is the standard deviation and what is the probability that a student scored higher than 322 if the mean test score is 312 and 16 percent of the scores are under 307?

Last Answer : Assuming a normal distribution:If 16% are less than 307, then 84% are greater than 307.Using single tailed normal tables we want the z value whichgives 84%-50% = 34% = 0.34 to the left of the mean; this is z ≈ ... 1 - 0.977 = 0.023 = 2.3 % are greater than 322→ probability greater than 322 is 2.3%

How many of scores will be within 1 standard deviation of the population mean?

Description : How many of scores will be within 1 standard deviation of the population mean?

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method requires the following data pertaining annual flood series (i) Mean value (ii) Standard deviation (iii) Length of record (iv) Coefficient of skew The correct answer is (A) (i) and (ii) (B) (i),(i) and (iii) (C) (i), (ii) and (iv) (D) (i), (ii), (iii) and (iv)

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Last Answer : Answer: Option B

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The distribution of heights of American women aged 18 to 24 is approximately normally distributed with a mean of 65.5 inches and standard deviation of 2.5 inches. Calculate the z-score for a woman six feet tall. a. 2.60 b. 4.11 c. 1.04 d. 1.33

Description : The distribution of heights of American women aged 18 to 24 is approximately normally distributed with a mean of 65.5 inches and standard deviation of 2.5 inches. Calculate the z-score for a woman six feet tall. a. 2.60 b. 4.11 c. 1.04 d. 1.33

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Provided that the ACT is reasonably normally distributed with a mean of 18 and standard deviation of 6, determine the proportion of students with a 33 or higher. a. 0.0062 b. 0.0109 c. 0.0124 d. 0.0217

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Last Answer : a. 0.0062

A national random sample of 20 ACT scores from 2010 is listed below. Calculate the sample mean and standard deviation. 29, 26, 13, 23, 23, 25, 17, 22, 17, 19, 12, 26, 30, 30, 18, 14, 12, 26, 17, 18 a. 20.50, 5.79 b. 20.50, 5.94 c. 20.85, 5.79 d. 20.85, 5.94

Description : A national random sample of 20 ACT scores from 2010 is listed below. Calculate the sample mean and standard deviation. 29, 26, 13, 23, 23, 25, 17, 22, 17, 19, 12, 26, 30, 30, 18, 14, 12, 26, 17, 18 a. 20.50, 5.79 b. 20.50, 5.94 c. 20.85, 5.79 d. 20.85, 5.94

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Given IQ scores are approximately normally distributed with a mean of 100 and standard deviation of 15, the proportion of people with IQs above 130 is: a. 95% b. 68% c. 5% d. 2.5%

Description : Given IQ scores are approximately normally distributed with a mean of 100 and standard deviation of 15, the proportion of people with IQs above 130 is: a. 95% b. 68% c. 5% d. 2.5%

Last Answer : d. 2.5%

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Description : In a large random data set following normal distribution, the ratio (%) of number of data points which are in the range of (mean ± standard deviation) to the total number of data points, is (A) ~ 50% (B) ~ 67% (C) ~ 97% (D) ~ 47%

Last Answer : Answer: B

Statistics question. Finding the standard deviation for these numbers: 1, 2, 98, 100, 105.

Description : Statistics question. Finding the standard deviation for these numbers: 1, 2, 98, 100, 105.

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How to understand this Standard Deviation question?

Description : How to understand this Standard Deviation question?

Last Answer : So, this question is related to the definition of standard deviation, rather then having to calculate it. I refer you to wikipedia, which has a decent write-up. Specifically the rules for normally distributed data ... the math there is too high-level, just take a good look at the plot on the right.

Range, and Standard Deviation?

Description : Range, and Standard Deviation?

Last Answer : http://en.wikipedia.org/wiki/Range_%28statistics%29 http://en.wikipedia.org/wiki/Arithmetic_mean http://en.wikipedia.org/wiki/Standard_deviation#Basic_example_of_a_population_standard_deviation

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Last Answer : Ideal deviation is a statistical method of measuring business risk.

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What is the standard deviation of the following data set rounded to the nearest tenth 52.1 45.5 51 48.8 43.6?

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Last Answer : Feel Free to Answer

In the Empirical Rule of data will fall in with two standard deviation.?

Description : In the Empirical Rule of data will fall in with two standard deviation.?

Last Answer : Approx 95% of the observations.

In the Empirical Rule of data will fall in with two standard deviation.?

Description : In the Empirical Rule of data will fall in with two standard deviation.?

Last Answer : Approx 95% of the observations.

What is the qualifying time for the fastest 5 percent of all runners if the average finishing time is 5 minutes 17 seconds with standard deviation of 12 seconds?

Description : What is the qualifying time for the fastest 5 percent of all runners if the average finishing time is 5 minutes 17 seconds with standard deviation of 12 seconds?

Last Answer : Assuming a normal distribution:For the fastest 5% we need to find the z value which gives 100%- 5% = 95% of the area under the normal curve (from -∞).Using single tailed tables, we need the z value which gives 95%- 50% ... deviation≈ 5 min 17 sec + 1.645 12 sec≈ 5 min 17 sec + 20 s= 5 min 37 sec

What is the standard deviation if P 0.2 and n 400?

Description : What is the standard deviation if P 0.2 and n 400?

Last Answer : The answer depends on what the distribution is!

In which of the following towns does the LMT (Local Meridian Time) show the greatest deviation from the 1ST (Indian Standard Time) ? [NDA 1991] (a) Delhi (b) Cochin (c) Mumbai (d) Kohima

Description : In which of the following towns does the LMT (Local Meridian Time) show the greatest deviation from the 1ST (Indian Standard Time) ? [NDA 1991] (a) Delhi (b) Cochin (c) Mumbai (d) Kohima

Last Answer : Ans: (d)

The standard deviation of the variation in the transmission loss of a circuit should not exceed A. 3 dB B. 1 dB C. 5 dB D. 0.5dB

Description : The standard deviation of the variation in the transmission loss of a circuit should not exceed A. 3 dB B. 1 dB C. 5 dB D. 0.5dB

Last Answer : B. 1 dB

Political unrest, budget overruns, size and complexity of the project Answer: B (8)Decision trees are best used for : 1. Determining the interaction of the amount at stake and the expected value 2. Association of the probabilities with the risk events 3. An illustration of how to see the interactions between decisions and the associated events 4. A flow chart which determines the standard deviation of the risk event

Description : Political unrest, budget overruns, size and complexity of the project  Answer: B  (8)Decision trees are best used for : 1. Determining the interaction of the amount at stake and the expected ... and the associated events  4. A flow chart which determines the standard deviation of the risk event

Last Answer : 3. An illustration of how to see the interactions between decisions and the associated events

If the expected time for completion of a project is 10 days with a standard deviation of 2 days, the expected time of completion of the project with 99.9% probability is (A) 4 days (B) 6 days (C) 10 days (D) 16 day

Description : If the expected time for completion of a project is 10 days with a standard deviation of 2 days, the expected time of completion of the project with 99.9% probability is (A) 4 days (B) 6 days (C) 10 days (D) 16 day

Last Answer : (D) 16 days

If the expected time of completion of a project is 60 weeks with a standard deviation of 5 weeks, the probability of completing the project in 50 weeks and 65 weeks respectively will be (A) 2.3% and 84.1% (B) 97.7% and 84.1% (C) 97.7 % and 15.9% (D) 15.9% and 97.7%

Description : If the expected time of completion of a project is 60 weeks with a standard deviation of 5 weeks, the probability of completing the project in 50 weeks and 65 weeks respectively will be (A) 2.3% and 84.1% (B) 97.7% and 84.1% (C) 97.7 % and 15.9% (D) 15.9% and 97.7%

Last Answer : (A) 2.3% and 84.1%

If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is (A) 10 % (B) 12.5 % (C) 15 % (D) 18.5%

Description : If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is (A) 10 % (B) 12.5 % (C) 15 % (D) 18.5%

Last Answer : Answer: Option B

86. To apply Shewhart-cusum combined procedure, the Shewhart control limits should be applied almost standard deviation from the center. a) 2 b) 1 c) 1.5 d) 3.5

Description : 86. To apply Shewhart-cusum combined procedure, the Shewhart control limits should be applied almost standard deviation from the center. a) 2 b) 1 c) 1.5 d) 3.5

Last Answer : 2

As per IS: 456-2000, recommended value for standard deviation for concrete mix from M30 to M50 is [ A ] 1 N/mm2 [ B ] 2 N/mm2 [ C ] 4 N/mm2 [ D ] 5 N/mm2

Description : As per IS: 456-2000, recommended value for standard deviation for concrete mix from M30 to M50 is [ A ] 1 N/mm2 [ B ] 2 N/mm2 [ C ] 4 N/mm2 [ D ] 5 N/mm2

Last Answer : [ D ] 5 N/mm2

As per IS:456, the strength of concrete sample is less than [ A ] The characteristic strength minus 1.35times the standard deviation [ B ] 0.80 times the characteristic strength [ C ] Greater of (a) and (b) [ D ] None of the above

Description : As per IS:456, the strength of concrete sample is less than [ A ] The characteristic strength minus 1.35times the standard deviation [ B ] 0.80 times the characteristic strength [ C ] Greater of (a) and (b) [ D ] None of the above

Last Answer : [ C ] Greater of (a) and (b)

_________ is a measure of risk-adjusted return a. Simple return b. Standard Deviation c. Beta d. Sharpe Ratio ANS: Sharpe Ratio

Description : _________ is a measure of risk-adjusted return a. Simple return b. Standard Deviation c. Beta d. Sharpe Ratio ANS: Sharpe Ratio

Last Answer : ANS: Sharpe Ratio

Which measures the systematic or non -systematic risk of a security ? a. Beta c. standard deviation b. Variance d. Range

Description : Which measures the systematic or non -systematic risk of a security ? a. Beta c. standard deviation b. Variance d. Range

Last Answer : Answer :a

A measure of risk per unit of expected return A.standard deviation B . Coefficient of variation C.Correlation coefficient D. Beta

Description : A measure of risk per unit of expected return A.standard deviation B . Coefficient of variation C.Correlation coefficient D. Beta 

Last Answer : Answer: B 

What is the approximate bandwidth of an FM system with 10 kHz of modulating frequency and a 150 kHz of frequency deviation? A. 300 kHz B. 320 kHz C. 150 kHz D. 200 kHz

Description : What is the approximate bandwidth of an FM system with 10 kHz of modulating frequency and a 150 kHz of frequency deviation? A. 300 kHz B. 320 kHz C. 150 kHz D. 200 kHz

Last Answer : B. 320 kHz

What is the deviation ratio for an FM-phone signal having a maximum frequency swing of plus or minus 5 kHz and accepting a maximum modulation rate of 3kHz? A. 60 B. 0.16 C. 0.6 D. 1.66

Description : What is the deviation ratio for an FM-phone signal having a maximum frequency swing of plus or minus 5 kHz and accepting a maximum modulation rate of 3kHz? A. 60 B. 0.16 C. 0.6 D. 1.66

Last Answer : D. 1.66

What is meant by the term modulation index? A. The processor index. B. The ratio between the deviation of a frequency modulated signal and the modulating frequency. C. The FM signal-to-noise ratio. D. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.

Description : What is meant by the term modulation index? A. The processor index. B. The ratio between the deviation of a frequency modulated signal and the modulating frequency. C. The FM signal-to-noise ratio. D. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.

Last Answer : B. The ratio between the deviation of a frequency modulated signal and the modulating frequency.

What is meant by the term deviation ratio? A. The ratio of the audio modulating frequency to the center carrier frequency. B. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency. C. The ratio of the carrier center frequency to the audio modulating frequency. D. The ratio of the highest audio modulating frequency to the average audio modulating frequency.

Description : What is meant by the term deviation ratio? A. The ratio of the audio modulating frequency to the center carrier frequency. B. The ratio of the maximum carrier frequency deviation to the highest ... . D. The ratio of the highest audio modulating frequency to the average audio modulating frequency.

Last Answer : B. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.

What is meant by the term deviation ratio? A. The ratio of the carrier center frequency to the audio modulating frequency B. The ratio of the highest audio modulating frequency to the average audio modulating frequency C. The ratio of the maximum carrier frequency deviation to the highest audio modulation frequency D. The ratio of the audio modulating frequency to the center carrier frequency

Description : What is meant by the term deviation ratio? A. The ratio of the carrier center frequency to the audio modulating frequency B. The ratio of the highest audio modulating frequency to the ... audio modulation frequency D. The ratio of the audio modulating frequency to the center carrier frequency

Last Answer : C. The ratio of the maximum carrier frequency deviation to the highest audio modulation frequency

Refer to the deviation of the operating frequency of a crystal oscillator from its nominal value due to temperature variations. A. Drift B. Flash over C. Frequency deviation D. Deviation ratio

Description : Refer to the deviation of the operating frequency of a crystal oscillator from its nominal value due to temperature variations. A. Drift B. Flash over C. Frequency deviation D. Deviation ratio

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What is meant by frequency deviation?

Description : What is meant by frequency deviation?

Last Answer : The difference between the carrier frequency of an fm signal and its maximum frequency excursion when modulated.

In the event of an act of unlawful interference, which of the following is the correct procedure to be taken by the pilot in command? a. Squawk 7700 if the situation requires and continue the flight as per the ATC clearance received if possible b. Squawk 7500 and broadcast a warning to ATC other traffic on 121.500MHz or the frequency in use whilst maintaining the flight as cleared c. Squawk 7500 (or 7700 if required) and broadcast a warning if the situation forces deviation from the cleared flight plan d. If forced to deviate from the flight plan, climb or descend to altitudes that differ from the normal cruising altitudes by 1000ft

Description : In the event of an act of unlawful interference, which of the following is the correct procedure to be taken by the pilot in command? a. Squawk 7700 if the situation requires and continue ... the flight plan, climb or descend to altitudes that differ from the normal cruising altitudes by 1000ft

Last Answer : c. Squawk 7500 (or 7700 if required) and broadcast a warning if the situation forces deviation from the cleared flight plan

In a FM system, the maximum deviation is 75KHz. Find bandwidth for modulating frequency i. fm=500Hz ii. fm=5KHz iii. fm=10KHz Draw conclusion for bandwidth of FM from answer.

Description : In a FM system, the maximum deviation is 75KHz. Find bandwidth for modulating frequency i. fm=500Hz ii. fm=5KHz iii. fm=10KHz Draw conclusion for bandwidth of FM from answer.

Last Answer : Given deviation∆=75kHz i) fm=500Hz bandwidth B.W=2(∆+fm)  =2(75k+500)=151kHz  ii). fm=5KHz bandwidth B.W=2(∆+fm)  =2(75k+5k)=160KHz iii) fm=10KHz bandwidth B.W=2(∆+fm)  =2(75k+10k)=170KHz As the modulating frequency increases bandwidth also increases.

Compare narrow band FM with wide-band FM w.r.t. following points. (i) Modulation index (ii) Maximum deviation (iii)Range of modulating frequency (iv)Application

Description : Compare narrow band FM with wide-band FM w.r.t. following points. (i) Modulation index (ii) Maximum deviation (iii)Range of modulating frequency (iv)Application

Last Answer : Sr. No Parameters Narrow band FM Wide band FM 1 Modulation index Less than or slightly greater than 1 Greater than 1  2 Maximum deviation ... like police wireless, ambulance etc. Entertainment broadcasting can be used for high quality music transmission 

In commercial FM broadcasting, the maximum frequency deviation is normally

Description : In commercial FM broadcasting, the maximum frequency deviation is normally   (A) 5 KHz (B) 15 KHz (C) 75 KHz (D) 200 KHz

Last Answer : In commercial FM broadcasting, the maximum frequency deviation is normally 75 KHz

For FM signal, the frequency deviation

Description : For FM signal, the frequency deviation

Last Answer : For FM signal, the frequency deviation Independent of the modulation frequency

The modulation index of a FM Signal having modulating frequency 2 KHz and Max deviation is 10 KHz, is: -

Description : The modulation index of a FM Signal having modulating frequency 2 KHz and Max deviation is 10 KHz, is: -  a) 2 b) 5 c) 3 d) 4

Last Answer : The modulation index of a FM Signal having modulating frequency 2 KHz and Max deviation is 10 KHz, is: - 5

Use of " vs. '. Is there a standard?

Description : Use of " vs. '. Is there a standard?

Last Answer : answer:You use the same kind of quotation mark as you would for anything else. So British English will standardly use the single quote and American English will standardly use the double quote. ... Sally frequently confuses the words literally' and figuratively' when speaking, James said.

Do there exist standard speeds at which online communities grow (if they're well executed and useful, of course)?

Description : Do there exist standard speeds at which online communities grow (if they're well executed and useful, of course)?

Last Answer : It all depends on the target audience. A broader group will inevitably lead to faster growth. The distinction between paid and free also changes things.