At Modell’s Sporting Goods Store, their records show that 1 out of every 4 balls purchased by a customer is a football. What is the probability that a football will NOT be purchased when a customer buys a ball?

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.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

3x = 729 solve for x plz . it's urgent. will mark