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14-04-2016
Mathematics

contestada

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

Respuesta :

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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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