If you add the lengths (in inches) of all the fish in a tank, there should be at least one gallon of water for each inch. sam has five fish of the following lengths: 1 1/4in, 1 1/2in, 1 5/8in, 1 3/4in, and 1 7/8in. what is the minimum amount of water his fish tank should contain?

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.