For males in a certain town, the systolic blood pressure is normally distributed with a mean of 110 and a standard deviation of 10. What percentage of males in the town that have a systolic blood pressure between 113 and 134, to the nearest tenth?

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.