Asked by alyson

After 7 spelling test Matthew scored 68, 81, 90, 95, 51, 83, and 85. If he wants his average to be 80, what does his next score need to be.
Answered by PsyDAG
mean = ∑x/n

80 = (68+81+90+95+51+83+85+x)/8

Solve for x.
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