Crop yield is the ratio of the number of bushels harvested to the number of acres used for the harvest. this year, the harvest at a farm was 94,010 bushels of grain, resulting in a crop yield of 170 bushels per acre. to the nearest whole acre, how many acres were harvested?

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.