The right triangle given below was drawn using a scale factor of . Each small square on the grid has a side length of 2 inches. The length of the base of the given right triangle is inches. The height of the given right triangle is inches. Therefore, based on the given right triangle, the area of the original triangle is square inches.

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.