Commemorative coins come in packs of 15,while coin holders come in packs of 25. what are the least numbers of packs you should buy in order to have the same numbers 9f coins and coins holders

In the rectangle below ac=30 units what is de

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?

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.