The frequency distribution listed in the table represents the travel time to work (in minutes) for a

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.

Distribution
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