Your test scores are 75, 93, 90, 82 and 85. What is the lowest score you can obtain on the next test to achieve an average of at least 86?

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Your test scores are 75, 93, 90, 82 and 85. What is the lowest score you can obtain on the next test to achieve an average of at least 86?

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Answer 1 · 2016-11-15T06:12:50

I would have to score at least $91$ on the next test.

Explanation:

An average is calculated by adding the figures and dividing by the number of figures. Since we have $5$ given figures and $1$ awaited figure (a total of $6$ ) to achieve an average of 86, we can write an equation:

$(75+93+90+82+85+x)/6=86$

Simplify the numerator on the left.

$(425+x)/6=86$

Multiply both sides by $6$ .

$425+x=86xx6$

$425+x=516$

Subtract $425$ from both sides.

$x=91$

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Your test scores are 75, 93, 90, 82 and 85. What is the lowest score you can obtain on the next test to achieve an average of at least 86?

1 Answer

Explanation:

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