Your parents compete in an ironman competition the table shows the finish time in minutes for each of the competition, bike 384.12, swim 76.28, run 265.25. the swim course is 2.4 miles long and the bike course is 112 miles how many times greater is the miles per hour for the bike portion than the swim portion

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.