Savannah and Sarah are planing on riding their bike to a point located 1100 feet from their house . Their bike tires have a diameter of of 26 inches. How many revolutions will their tire make on the path from their house to the park?

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.