IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a certain statistician has an IQ of 122, what percent of the population has an IQ less than she does?

A. 7%

B. 22%

C. 93%

D. 99%

E. 47%

Question

Mathematics

Timothy Graves

19 December, 00:42

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a certain statistician has an IQ of 122, what percent of the population has an IQ less than she does?

A. 7%

B. 22%

C. 93%

D. 99%

E. 47%

+3

Answers (1)

Know the Answer?

Aden · Answer 1

Z = (122-100) / 15 = 22/15 = 1.467

Then we have to use a z-table for a normal distribution.

The percent of the population that has an IQ less than she does is C) 93%

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a certain statistician has an IQ of 122, what percent of the population has an IQ less than she does?A. 7%B. 22%C. 93%D. 99%E. 47%

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a certain statistician has an IQ of 122, what percent of the population has an IQ less than she does?

A. 7%

B. 22%

C. 93%

D. 99%

E. 47%