Question

Assume the distribution of IQ scores for adults can be modeled with a normal distribution with a mean score of 100 points and a standard deviation of 10 points. 30% of adults will have an IQ score higher than what value?

Answer 1

Explanation:

Use z-score table to find the z-score that corresponds to .7000 ( 70%)

approx .525 s.d. above the mean

.525 * 10 = 5.25 points above 100 = 105.25