82 * 4 = 328
90 * 5 = 450
She needs 122 points on the last test. Is that possible?
after her first four tests,Alisa has a mean score of 82.One more 100-point test is to be given in this class.All of the test scores are of equal importance.Is it possible for Alisa to raise her average (mean ) to 90?Explain.
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