Kelso's mom wants to put a floating blanket over the families circular wading pool to keep the heat in and the leaves out the pool has a diameter of 10 feeta. how many square feet will kelso's mother need? b. if the pool supply stores charges $0.10 per square foot for the blanket how much will the material for the blanket cost

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.