29. Smartphone Shopping According to a USA Today snapshot, a large proportion of American shoppers own smartphones and use them while shopping to take pictures of items (51%), to search for coupons (49%) or to compare prices among retailers (43%)

Suppose that a random sample of 50 American shoppers is selected and x is the number who use their phones to search for coupons. Assume that the 49% figure is correct.

a. What is the average number of shoppers who use their smartphones to search for coupons?

b. What is the standard deviation of x?

c. If you were to observe a value of x less than or equal to 15, would you consider this to be an unusual occurrence? Explain

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'SMART' SHOPPING Some 70% of U.S. shoppers own a smartphone. More than half use them when shopping to: Take pictures of products 51% Search for compos 49% Compare prices among 43%