Let's go to the movies: A random sample of 42 Hollywood movies made in the last 10 years had a mean length of 110.2 minutes, with a standard deviation of
12.3 minutes.

(a) Construct a 90% confidence interval for the true mean length of all Hollywood movies in the last 10 years. Round the answers to at least one decimal
place.
A 90% confidence interval for the true mean length of all Hollywood movies made in the last 10 years is