Question

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a certain person has an IQ of 131, what percentage of the population has a lower IQ?

Answer 1

Hint:
calculate \(Z=\frac{X-\mu}{\sigma}\) and look up the normal distribution table for P(z\(\le\)Z)

Answer 2

use calculator: hit 2nd, vars, then hit 0, 131, 100,15) then enter.

Answer 3

thank you!