# Question: 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.

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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