Posted by **Peter** on Wednesday, September 26, 2012 at 3:54am.

Thomas needs a b in his class. his current test scores are 88, 83, 86 and 72. his final exam is worth 3 test scores. In order to ear a b Thomas average must lie between 80 and 89 inclusive. what range of scores can Thomas receive on the final to earn a b in the class?

- statistics -
**Scott**, Wednesday, September 26, 2012 at 2:39pm
80 ≤ [(88 + 83 + 86 + 72 + 3x) / 7] ≤ 89

- statistics -
**Anonymous**, Wednesday, September 14, 2016 at 5:49pm
80≤329+3x/7≤89

Multiply everything by "7"

560≤329+3x≤623

Subtract everything by "329"

231≤3x≤294

Divide everything by "3"

77≤x≤42

Thomas has to receive at least a 77.

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