Aisha has a pet golden retriever named Lucky. She walks Lucky every night. Yesterday, Aisha and Lucky took a 45-minute walk and walked 3 miles. Today, Aisha plans to walk Lucky for only 30 minutes. If they keep the same pace, how many miles will Aisha and Lucky walk today?

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.