PLEEAASSEE HPPP A box contains three blue marbles, five red marbles, and four white marbles. If 3 marbles are drawn at random and not returned to the bag, what is the probability that all 3 will be red?

Divide. write in the simplest form. 4 1/6 divided by 10

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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.