90% confidence interval for population mean as well

The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below. 2.3 3.1 290 Assume the population is normally distributed. 1.7 0.8 4.0 2.1 1.3 3.7 0.4 2.2 3.4 x=| | (Round to two decimal places as needed.) (b) Find the sample standard deviation. K s= (Round to two decimal places as needed.) () Panelist a any. confidence intensal for the nonuilation mean