Question 22 mary has scored 79, 91, 64, 65, and 71 on her previous five tests. what score does she need on her next test so that her average (mean is 77?

So u want to add all of the previous scores together and divide them by the number of scores [i. e: 79+91+64+65+71 = 370 then u divide. 370/5 (since there are 5 sets of scores) which gets you 74.] Then it's kind of a guess and check from there.

Answer: 92