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In: Statistics and Probability

A random sample of 15 people was asked to record how much TV they watched every...

A random sample of 15 people was asked to record how much TV they watched every day for a week. The total number of hours each person watched during the week is displayed below.

a. Is a normal approximation appropriate here?


A. Yes
B. No

The data are shown below.

0.0 7.8 8.6 9.7 11.3
17.7 19.0 19.1 19.5 20.4
22.9 25.8 33.8 36.8 39.2

b. If a normal approximation is appropriate, find the probability that a randomly selected person in the population watches less than 9 of TV per week. If a normal approximation is not appropriate, type “NA” (without the quotes).

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