Question

The Intelligence Quotient (IQ) test scores for adults are normally distributed with a population mean of 100 and a population standard deviation of 20. What is the probability we could select a sample of 90 adults and find the mean of this sample is less than 95?

Answer 1

The probability that you could select a sample of 90 adults and find the mean of this sample to be less than 95 is approximately 0.0092, or about 0.92%