boris has scored 90, 94 and 61 on his previous three tests. what score does he need on his next res so that his average (mean) is 76?
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Let the score on the last test be x
The total number of tests after the last test will be 4
mean = (90 +94 +61 +x) /4 = 76
(245 + x) /4 = 76
Multiply by 4 on both sides
245 + x = 76 * 4
245 + x = 304
subtract 245 from both sides
x = 304 - 245 = 59
59 is his score on the test if his average score is 76
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