# Question

The frequency distribution listed in the table represents the travel time to work (in minutes) for a random sample of 895 U.S. adults.

Travel Time (minutes) ... Frequency

0-9 ........... 125

10-19 ........... 271

20-29 ........... 186

30-39 .......... 121

40-49 .......... 54

50-59 .......... 62

60-69 ........... 43

70-79 ........... 20

80-89 ........... 13

(a) Approximate the mean travel time to work for U.S. adults.

(b) Approximate the standard deviation travel time to work for U.S. adults.

Travel Time (minutes) ... Frequency

0-9 ........... 125

10-19 ........... 271

20-29 ........... 186

30-39 .......... 121

40-49 .......... 54

50-59 .......... 62

60-69 ........... 43

70-79 ........... 20

80-89 ........... 13

(a) Approximate the mean travel time to work for U.S. adults.

(b) Approximate the standard deviation travel time to work for U.S. adults.

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