Beachbody, LLC, provides fitness programs, including home workout videos and nutrition. P90X, or Power 90 Extreme, is a home exercise program that consists of an intense series of workout DVDs. It is a 90-day program that uses the term "muscle confusion" to refer to their training methods. There are a total of 12 workout DVDs included with the program, each targeting a different muscle group. According to their official website, the lengths, in minutes, of the 12 DVDs are as follows.

a. Obtain and interpret the population mean length of the P90X DVDs.
b. Obtain and interpret the population standard deviation of the lengths of the P90X DVDs.

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