There are 4 queens in a standard deck of 52 cards. you pick one card at random. what is the probability of not picking a queen?

Josue tosses a coin and spins the spinner at the right. what are all the possible outcomes

What is the rule for reflection across the y axis

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.