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posted by EmilyS. Friday, July 15, 2011 at 4:55pm.
Pablo has scored 64, 77, and 82 on his previous three tests. What score does he need on his next test so that his average (mean) is 79?
400 * 0.79 = 316 64 + 77 + 82 = 223 316 - 223 = 93
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