Your parents have said that you can invite four friends to a game. The price of the tickets is listed below. If you purchase your tickets before May 30th, you will receive a 10% discount. Today is May 10th.

Ticket Price 1 ticket $30 total 2 tickets $55 total 4 tickets $105 total

What is the cost of 5 tickets when purchased after May 30th? _
What is the cost of 5 tickets when purchased before May 30th?_

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.