1.

Find the mean of all prime numbers between 50 and 80.

Answer»

We know that

All prime numbers between 50 and 80 = 53, 59, 61, 67, 71, 73 and 79

So we get

Mean = sum of numbers/ total numbers

By substituting the values

Mean = (53 + 59 + 61 + 67 + 71 + 73 + 79)/7

On further calculation

Mean = 463/7

So we get

Mean = 66 1/7

Therefore, the mean of all prime numbers between 50 and 80 is 66 1/7.



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