Money surveyed mutual funds as a good investment instrument.5 Suppose that the annual average percentage return from mutual funds is a normally distrib- uted random variable with mean 8.7% and standard deviation 5%, and suppose that a random sample of 50 such funds gave a mean return of 10.1% and standard devia- tion of 4.8%. Compute a 95% highest-posterior-density credible set for the average annual mutual fund return.