×

Hello! Socratic's Terms of Service and Privacy Policy have been updated, which will be automatically effective on October 6, 2018. Please contact hello@socratic.com with any questions.

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability of a score greater than 110?

A group of 9 people take an IQ test.
What is the probability that their average is greater than 93?
What is the probability that their average is 100?