Question Help The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below. 2.1 3.1 2.5 0 1.9 0.9 4.0 Assume the population is normally distributed. 2.3 1.2 3.7 0.3 2.5 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 90% confidence interval for the population mean u. A 90% confidence interval for the population mean is () (Round to two decimal places as needed.)