The lengths (in minutes) of a sample of cell phone calls are shown:

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Presentation transcript:

The lengths (in minutes) of a sample of cell phone calls are shown: 6 19 3 6 12 8 Find the mean. 54 9 6 7 Section 3.1 2

The lengths (in minutes) of a sample of cell phone calls are shown: 6 19 3 6 12 8 Find the median. 3.5 9 6 7 Section 3.1 3

The lengths (in minutes) of a sample of cell phone calls are shown: 6 19 3 6 12 8 Find the mode. 3 9 6 7 Section 3.1 4

The lengths (in minutes) of a sample of cell phone calls are shown: 6 19 3 6 12 8 Find the range. 2 16 13 9 Section 3.2 5

The lengths (in minutes) of a sample of cell phone calls are shown: 6 19 3 6 12 8 Find the standard deviation. 5.7 5.2 32.8 16 Section 3.2 6

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

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

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. 3.14 5.70 6.72 15.63 17.75 28.12 31.24 40.87 71.64 29.845 68.32 6.21 36.055 Section 3.5 9

Use the boxplot to identify the first quartile. 10 18 24 26 10 18 24 26 30 | | | | | | | | | | | 10 12 14 16 18 20 22 24 26 28 30 Section 3.5 10