The frequency distribution listed in the table represents the travel
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.
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