4. All-in-one sound systems, called minisystems, typically include an AM/FM tuner, a dualcassette tape deck, and a CD changer in a book-sized box with two separate speakers. The data in Table 1.7 show the retail price, sound quality, CD capacity, FM tuning sensitivity and selectivity, and the number of tape decks for a sample of 10 minisystems (Consumer Reports Buying Guide 2002).

a. How many elements does this data set contain?

b. What is the population?

c. Compute the average price for the sample.

d. Using the results in part (c), estimate the average price for the population.