5. (12 points) According to the Centers for Disease Control (CDC) a
5. (12 points) According to the Centers for Disease Control (CDC)
and Prevention, approximately 86% of all Americans wear seatbelts. Consider a randomly selected group of 50 Americans. (This is a binomial experiment.) a) Find the mean. b) Find the variance. c) Find the standard deviation. Find the probability that d) 38 wear seatbelts. e) At most 38 wear seatbelts. f) Suppose 38 out of the 50 randomly selected Americans wear seatbelts, would this be considered unusual? Why or why not?
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