Question

The mean of a set of test scores is 86 and the standard deviation is 3. If there are 200 test scores in the data sample, how many of them were in the 86% to 89% range?

Answer 1

If the mean is 86 and standard deviation is 3 then test scores from 86 to 89 are from the mean to one standard deviation above; that's 34% of the area under the normal curve, so 200(.34) = 68

Answer 2

Thank you

Answer 3

welcome