A camp needs 100 students to help with 4-year-old campers. Eight students from 4 different classes have agreed to help. How many more students are there needed?

If i have one apple and give you the apple, how many apples do i have?

Precalculus question, image attached.

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.