A random sample of 25 students had a grade point average with a mean of 2.86. Past studies have shown that the population standard deviation is 0.15 and the population is normally distributed....

A random sample of 25 students had a grade point average with a mean of 2.86. Past studies have shown that the population standard deviation is 0.15 and the population is normally distributed. Construct a 90% confidence interval for the population mean grade point average.