The grade point averages (gpa) for 12 randomly selected college students are shown below. Assume the population is normally distributed:
2.3, 3.4, 2.9, 1.8, 0.9, 4.0, 2.4, 1.1, 3.6, 0.1, 2.4, 3.5
a) Find the sample mean
b) Find the sample standard deviation
c) Find the 99% confidence interval for population mean?