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If a student has 78 percent average on her first seven tests what must she score on the 8th exam to achieve an average of 80 percent overall I need to formula to figure this out?
Wiki User
∙ 14y ago
(8 x 80) - (7 x 78) ie 640 - 546 = 94. Not particularly likely?
Wiki User
∙ 14y ago
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CHI3
