How is shading a grid to show 1 tenth different from shading a gird from 100?

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.

Are the corresponding angles congruent? explain why or why not.

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid