George earns $8 per hour for his babysitting job. he also receives a $10 bonus for any day he works past 6 p. m. last month, george babysat: five days for 3 hours each, two days for 5 hours each, on 2 of those days he worked past 6 p. m. which expressions represent the total amount of money george received for babysitting last month?

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.