Amanufacturer inspects 400 personal video players that 397 of the have no defects. the manufacturer sent a shipment of 1,500 video playes to a distributor. predict the number of players in the shipment that are likely to have no defects

State if the two triangles are congruent. if they are, state how you know?

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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.