Can someone help me please!!

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.

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect