A tyre manufacturing company kept a record -Maths 9th

A tyre manufacturing company kept a record -Maths 9th
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The total number of trials = 1000  (i) P (tyre to be replaced before it covers 4000 km) = 20/1000 = 0.02 (ii) The frequency of a tyre that will last more than 9000 km = 325 + 445 = 770  ∴ P (tyre will last for more than 9000 km) = 770/1000 =  0.77 (iii) The frequency of a tyre that requires replacement between 4000 km and 14000 km = 210 + 325 = 535  So, P (tyre requiring replacement between 4000 km and 14000 km) = 535/1000 = 0.535
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