Your body mass index (BMI) is your weight in kilograms divided by the square of your height in meters. A study by the National Center for Health Statistics found that the BMI of American men (ages 20-29) is approximately Normal with mean 26.8 and standard deviation 5.2. How high must a BMI be in order to place in the top 16% of all American men (ages 20-29)?

Could somebody me with this radical simplification?

Answer pls man im trying to get out of summer school

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.