Each can of paint will cover 450 tiles. augustin is painting 300 tiles in his bathroom, 675 in his kitchen, and 100 in his hallway. how many cans of paint does he need to buy? write and answer the hidden question then solve.

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.