Jacob is cutting strips from a foot-long piece of wood for his woodworking class. He needs a strip of wood that is foot long and another strip that is
foot long. Which of the following strips is shaded to show the total amount of wood Jacob needs for his class? If you know the answer, just tell me how many strips should be shaded please.

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.