2. The lengths (in minutes) of a sample of cell phone calls are shown:
Find the mean. 54 9 6 7
Section 3.1 2

3. The lengths (in minutes) of a sample of cell phone calls are shown:
Find the median.
3.5 9 6 7
Section 3.1 3

4. The lengths (in minutes) of a sample of cell phone calls are shown:
Find the mode. 3 9 6 7
Section 3.1 4

5. The lengths (in minutes) of a sample of cell phone calls are shown:
Find the range. 2 16 13 9
Section 3.2 5

6. The lengths (in minutes) of a sample of cell phone calls are shown:
Find the standard deviation.
5.7
5.2
32.8 16
Section 3.2 6

7. The mean commute time in the U. S. is 24
The mean commute time in the U.S. is 24.4 minutes with a standard deviation of 6.5 minutes. What is the minimum percentage of commuters that have commute times between 11.4 minutes and 37.4 minutes?
68%
75%
89%
95%
Section 3.2 7

8. The mean commute time in the U. S. is 24
The mean commute time in the U.S. is 24.4 minutes with a standard deviation of 6.5 minutes. Find the z-score that corresponds to a commute time of 15 minutes.
1.45
–1.45
11.25
–9.4
Section 3.4 8

9. The closing prices for 9 telecommunications stocks are shown below
The closing prices for 9 telecommunications stocks are shown below. Compute the interquartile range, IQR.
29.845
68.32
6.21
36.055
Section 3.5 9

10. Use the boxplot to identify the first quartile.10 18 24 26 10 18 24 26 30
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Section 3.5 10