4.48 Table 4.25 gives estimated percentages of sports footwear purchased by those in various age groups across the United States.

a Explain the meaning of the 4.7 under aerobic shoes. Explain the meaning of the 67.0 under walking shoes.

b Suppose the percentages provided in the table are to be used as probabilities in discussing anticipated purchases for next year. Explain the 28.5 under jogging/running shoes as a probability.

c Your firm anticipates selling 100,000 pairs of gym shoes/sneakers across the country. How many of these would you expect to be purchased by children under 14 years of age?

How many by 18–24-year-olds?

d You want to target advertising to 25–34-yearolds.

If someone in this age group buys sports footwear next year, can you find the probability that he or she will purchase aerobic shoes?

e Write a brief description of the patterns you see in sales of sports footwear.