Math Problem Solver

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.

2.5

3.1

2.9

1.6

0.7

4.0

2.2

1.3

3.7

0.4

2.4

3.5

Question content area bottom

Part 1

​(a) Find the sample mean.

x overbarequals

enter your response here ​(Round to two decimal places as​ needed.)

Part 2

​(b) Find the sample standard deviation.

sequals

enter your response here ​(Round to two decimal places as​ needed.)

Part 3

​(c) Construct a 95​% confidence interval for the population mean mu.

A 95​% confidence interval for the population mean is left parenthesis nothing comma nothing right parenthesis .

​(Round to two decimal places as​ needed.)