Hooke's Law says that the force exerted by the spring in a spring scale varies directly with the distance that the spring is stretched. If a 19 pound mass suspended on a spring scale stretches the spring 5 inches, how far will a 27 pound mass stretch the spring? Round your answer to one decimal place if necessary.

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.