On Monday, Wilbert did 20 push ups in a minute, took a 30 second rest and was able to complete a few more push-ups. He ended his Monday work out after 30 total pushups. On Friday, Wilbert did 25 push ups in a minute. He did a couple more after a 30 second break and ended his Friday with 40 push-ups. On what day did Wilbert experience a smaller percent change of push-ups? pleaser explain!
answer asp​

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.