THE WEEK IS HERE OMGGG I GOT MY EXAMS THIS WEEK AND I FOUND OUT THEY LIKE 50 QUESTIONSSS AND OTHER ONE 45 QUESTIONS AND THEN OTHER 30 THEY START WEDNESDAY AND END FRIDAY SO WE DONT EVEN GET THAT MUCH TIME ON THEMAND ITS CRAZ

When y’all answer can y’all explain too !

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.

Rationalize the denominator- 12x/√x-10