What do these symbols in maths mean.

What do these symbols in maths mean.
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answer:The first one means the sum of. It is used a lot in statistics such as ∑x/n is the mean for a group of numbers which basically says “the mean is the sum of the numbers divided by the number of terms”. The second is an integration sign. It is used to find the areas of curves. I won’t give an example of how this is done as its quite complicated to explain on first terms, but just look up integration and calculus on google/wikipedia.
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