Agrocery store sells a 6-pack of bottled water for $3.79 and a 12-pack of water for $6.89. find the unit price per bottle of water for the 6-pack (round to the nearest cent). find the unit price per bottle of water for the 12-pack (round to the nearest cent). which package costs the least per bottle?

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.