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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