4. Kim Lee is buying a sedan that has a base price of $24,827. The options total $1,242, and the destination charge is $270. The dealer's cost is 90 percent of the base price
and 85 percent of the price of the options. What will Lee pay if he can buy the vehicle
for $200 over the dealer's cost?

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.