If a data set has a mean of 90, and a standard deviation of 15, what is a number that is more than 2 standard deviations beneath the mean?

Question

If a data set has a mean of 90, and a standard deviation of 15, what is a number that is more than 2 standard deviations beneath the mean?

Answer 1

Mean is 90 and standard deviation is 15. So two standard deviations is 2 x 15 = 30.

Two standard deviations below the mean is 90 - 30 = 60. Any value less than 60 would be more than two standard deviations below the mean.

Answer 2

Any positive number less than 60