Add them all together then divide the sum by 100 (move the decimal point two places to the left).
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101
'from 100' ??? If you mean 'less than 100' then there are 25 primes. If you mean 'more than 100' then the answer is infinite, just like numbers are infinite.
multiply the mean by the amount of numbers
The mean is when you calculate the sum of a list of numbers and then you didvide by the number of numbers in the list.
Given a set of numbers, and its mean, we can find the difference between each of the numbers and the mean. If we take the mean of these differences, the result is called the mean deviation of the numbers.