Maria scored 72 , 97 , and 82 on her first three math tests. She wants to have a mean score of 82 for the quarter. How many points does she need on her last test to earn an 82 for the quarter?

To average 82 across 4 tests, Maria needs a total of 4 × 82 = 328 points. Her first three scores add to 72 + 97 + 82 = 251, so she needs 328 − 251 = 77 points on the last test. The correct choice is 77.

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