Asurvey asked stamp collectors how many stamps they have in their collection the box plot summarizes the response between what two numbers do the upper fourth of the responses fall93 and 11075 and 9370 and 11040 and 70

Sketch one cycle if the cosine function y=2cos2theta

What is the absolute value of the complex number -4-sqrt2i

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.