Tony bought 3 tickets to a concert for $78. how much will it cost for 6 tickets to the concert if all tickets have the same unit price? use the table below to determine the missing value: number of tickets 3 4 5 6 cost $78 $104 $130 ? $136 $146 $156 $234

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.