PLEASE HELP! Which statement does not describe a normal distribution?A. the distribution can have two modes. B. most of the observations are near the mean.
C. the number of observations trail off as you move away from the mean.
D. the median and mean are equal. ​

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.

Having a hard time understanding this question (see attachment).

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4