Computers Magazine has recently completed an analysis of its customer base. It has deter- mined that...

Computers Magazine has recently completed an analysis of its customer base. It has deter- mined that 75% of the issues sold each month are subscriptions and the other 25% are sold at newsstands. It has also determined that the ages of its subscribers are normally distributed with a mean of 44.5 and a standard deviation of 7.42 years, whereas the ages of its newsstand customers are normally distributed with a mean of 36.1 and a standard deviation of 8.20 years.

(a) Computers Magazine would like to make the following statement to its advertisers: “80% of our subscribers are between the ages of . . . and . . . .” Your job is to fill in the blanks, choosing a range that is symmetric around the mean. (In other words, the mean age of subscribers should be the midpoint of the range.) 1 plant manager of a manufacturing facility is concerned about drug use among plant

(b) What proportion of Computers Magazine newsstand customers have ages in the range you gave in (a)?

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orchestra answered 1 year ago

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