The weight of male Americans between the ages of 18 and 25 is normally distributed, with a mean of 164.5 lb and a standard deviation of 26 lb.
definition of obesity states that a person is obese if the z-score of his or her
weight is greater than 2.
One
What is the obesity threshold weight for a young adult American male? Round
your answer to the nearest tenth.
A. 177.5 lb
B. 190.5 lb
C. 203.5 lb
D. 216.5 lb

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.