A sleep study administered to U.S. adults showed that the amount of sleep (in hours) they get in a 24-hour period is normally distributed with a mean of 6.5 hours and a standard deviation of 1.25 hours. Use normal probability calculations to answer the following questions.

1. (1 pt) A simple random sample of 25 U.S. adults is taken. What is the probability that the sample mean hours slept is less than what you slept last night?

Answer rating: 100% (QA)

To find the probability we need to standardize the sample mean using the formula for ... View the full answer