The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below. 2.5 3.1 2.8 0 Assume the population is normally distributed. 1.8 0.9 4.0 2.1 1.4 3.9 0.2 2.2 3.3 (a) Find the sample mean. x= (Round to two decimal places as needed.) (b) Find the sample standard deviation. s= (Round to two decimal places as needed.) (c) Construct a 95% confidence interval for the population mean u. A 95% confidence interval for the population mean is (].D). (Round to two decimal places as needed.)