Question: Let be the mean (in points) of five test scores, x1, x2, x3, x4, and x5, all in points. a. Find a formula for

Let be the mean (in points) of five test scores, x1, x2, x3, x4, and x5, all in points.

a. Find a formula for the mean of the test scores.

b. If a student has test scores of 74, 81, 79, and 84, find the score he needs on the fifth test so that his five-test mean score is 80 points, which is the cutoff for a B.

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