Ch 5, 6, 7 Practice Test

Question

A set of test scores are normally distributed with a mean of 69.3 and a standard deviation of 11.1 points. If the scores in the eleventh percentile and below will receive an F, what test score will determine the boundary of the F grades?

Round your answer to the nearest tenth.

Answer 1

score = z * SD + mean

z for 11th percentile = -1.23

SD given as 11.1 and mean given as 69.3

substitute values and solve for score