Yoko has scored 81 , 84 , 84 , 69 , and 76 on her previous five tests. What score does she need on her next test so that her ave rage (mean) is 81 ?
1 answer:
Took must make a 92 on the next test. (81+84+84+69+76+x)/6=81 (394+x)/6=81 Multiply by 6 on both sides 394 + x = 486 Subtract 394 from both sides. x= 92
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