QUESTION 18

The grade point averages (GPA) for

12

randomly selected college students are shown on the right. Complete parts (a) through (c) below.

Assume the population is normally distributed.

2.4	3.1	2.6
1.5	0.6	4.0
2.3	1.5	3.8
0.2	2.1	3.4

(a) Find the sample mean.

x=________

(Round to two decimal places as needed.)

(b) Find the standard deviation

s=________

(Round to two decimal places as needed.)

(c) A 95% confidence interval for the population mean is _______, _______

(Round to two decimal places as needed.)