Catherine needs to sell boxes of cookies as a fundraiser for a team. she starts with 135 boxes and begins selling at a constant rate of 15 boxes each day. use the segment tool to plot a graph representing the number of boxes of cookies catherine has left to sell from the time she begins selling until the cookies are gone.

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.