Lester has a tent that is 5 feet wide by 12 feet long. Lester wants to buy a plastic tarp to go under the tent. The tarps are sold for $0.10 per square foot. How much would it cost to buy a
tarp that is the same size as Lester's tent?

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.