Question

Scores on IQ tests are normally distributed, with a mean of 100 and a standard deviation of 15. What is the score such that 10 percent of people taking the test achieve a higher score

Answer 1

103.75 score

Explanation:

10 % scored higher than the mean?

50% is the mean % so we need to look for the z score corresponding to 60 % from z-score table this is z-score of .25

.25 standard deviations (which is 15) above 100 =

.25 * 15 + 100 = 103.75 score