A blood plasma donation company accepts 40 4040 volunteers per day. Based on previous data, they know that 15 % 15%15, percent of volunteers will be turned away for some reason. Let X XX represent the number of patients that get turned away in a set of 40 4040 volunteers. Find the mean and standard deviation of X XX.

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

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.

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?