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14-04-2016
Mathematics

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The mean of a set of four test scores is 79. If three test scores are 77, 79, and 85, what is the fourth test score?
a. 83
b. 81
c. 79
d. 75

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14-04-2016

The answer would be D. 75
77+79+85+x=241

Let's see what 83+241=324/4=81 A is out.

81+241=322/4= 80.5 so B is out.

79+241=320/4=80 so C is out.

241+75=316/4 which is 79 is the correct answer.

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