3 the amount of time spent by american adults playing sports per week
3. The amount of time spent by American adults playing sports per week is normally
distributed with a mean of 4 hours and standard deviation of 1.25 hours.
a. Find the probability that a randomly selected American adult plays sports for more
than 5 hours per week.
b. Find the probability that if four American adults are randomly selected, their average
number of hours spent playing sports is more than 5 hours per week. (6 marks)
c. Find the probability that if four American adults are randomly selected, all four play
sports for more than 5 hours per week.
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