24 students have turned in their permission slips so far. this is 80% in the class. how many students are in the class.

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.

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.