In Problems 27-30 suppose that, for a certain exam, a teacher grades on a curve. It is

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In Problems 27-30 suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 50 and the standard deviation is 5.

There are 45 students in the class.

a. What score would be necessary to obtain an A?

b. If an exam paper is selected at random, what is the probability that it will be a failing paper?

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