Question

I need help with this question c)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.

2.2

1.8

2.3

0.3

3.4

0.5

1.4

2.3

2.9

4.0

3.6

3.4

C) Construct a 90% confidence interval for the population mean

A 90% confidence interval for the population mean is

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Question

he ages​ (in years) of a random sample of shoppers

at a gaming store are shown. Determine the​ range, mean,​ variance, and standard deviation of the sample data set.

12

12​, 20

20​, 23

23​, 14

14​, 16

16​, 16

16​, 22

22​, 18

18​, 14

14​, 19

19   

The range is

11

11.

​(Simplify your​ answer.)

The mean is

17.4.

​(Simplify your answer. Round to the nearest tenth as​ needed.)

The variance is

????

​(Simplify your answer. Round to the nearest hundredth as​ needed.)

The standard deviation is ???

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