# Question

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.

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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