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)?

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

Expert Solution

orchestra answered 1 year ago

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