The following data represent the length of time in minutes
The following data represent the length of time (in minutes) between eruptions of Old Faithful in Yellowstone National Park.
Time (minutes) .... Frequency
40-49 ........ 8
50-59 ........ 44
60-69 ......... 23
70-79 .......... 6
80-89 ......... 107
90-99 ......... 11
100-109 ........ 1
(a) Approximate the mean length of time between eruptions.
(b) Approximate the standard deviation length of time between eruptions.
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