You decided to go to the mall and find a sweatshirt that cost $25.80 on sale for 35% off. How much will you SAVE by buying the sweatshirt?

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.

Ineed here’s a picture of the question

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.