Find each experimental probability. Write your answer as a fraction, as a decimal, and as a percent. 5. For the past 40 days, Naomi has been recording the number of customers at her restaurant between 10:00 A. M. and 11:00 A. M. During that hour, there have been fewer than 20 customers on 25 out of the 40 days. a. What is the experimental probability there will be fewer than 20 customers on the forty-first day?

b. What is the experimental probability there will be 20 or more customers on the forty-first day?

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An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.