Two factory plants are making tv panels. yesterday, plant a produced
3
times as many panels as plant b. five percent of the panels from plant a and
2%
of the panels from plant b were defective. how many panels did plant b produce, if the two plants together produced
1530
defective panels?

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.