a ladder is leaning against the outside wall of a building. The figure at the right shows the view from the end of the building, looking directly at the side of the ladder. The ladder is exactly 10 feet long and makes an angle of 60 with the ground. If the ground is level, what angle does the ladder make with the side of the building? How far up does the ladder reach

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.