Question

A set of data with the mean of 60 and the standard deviation of 7.5 is normally distributed what is the -2 standard deviation from the mean

Answer 1

45 is 2 standard deviations below the mean (60).

Explanation:

2 standard deviations below the mean is equivalent to what you have written here.

To answer this, start with the mean (60) and subtract 2 standard deviations (2 times 7.5). Subtract, as indicated:

60 - 2(7.5) = 60 - 15 = 45