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29 July, 02:23

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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Answers (1)
  1. 29 July, 02:35
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    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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