Matthew's test scores are 88, 79, 81, and 86. What is the minimum score he can make on his next test to maintain a test average of at least 85?
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SOL:
avg =sum of all items/no. of items
required avg =85.
thus,85 should be equal to
88+79+81+86+x
----------------------
5
85=(334+x)/5
334+x=85 x 5
334+x=425
x=91
so, he should score at least 91 runs
avg =sum of all items/no. of items
required avg =85.
thus,85 should be equal to
88+79+81+86+x
----------------------
5
85=(334+x)/5
334+x=85 x 5
334+x=425
x=91
so, he should score at least 91 runs
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