Answer Happy

Geysers: The geyser Old Faithful in Yellowstone National Park alternates periods of eruption, which typically last from 1.5 to 4 minutes, with periods of dormancy, which are considerably longer. The following table presents the durations, in minutes, of 30 dormancy periods that occurred during a recent year. 90 90 97 89 97 89 82 88 92 91 116 90 71 93 88 92 66 90 83 90 91 89 97 97 93 59 82 82 90 59 8 Ⓒ

(a) Construct a frequency distribution using a class width of 7, and using 55 as the lower class limit for the first class. Dormancy Period Frequency X 5