Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $650 per week. how much did she earn last week if she sold $4,400 in electronics merchandise? round your intermediate calculations and answer to the nearest cent.

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.