Question: Feeling sleepy? Th e fi rst four students to arrive for a fi rst-period statistics class were asked how much sleep (to the nearest hour)

Feeling sleepy? Th e fi rst four students to arrive for a fi rst-period statistics class were asked how much sleep (to the nearest hour) they got last night. Th eir responses were 7, 7, 9, and 9.

(a) Use the formula to calculate the mean. Interpret this value.

(b) Use the method in Example 2.15 to calculate the deviation of each observation from the mean. Th en compute the standard deviation. Explain what this value means.

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