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Chris has scored 78, 61, and 91 on his previous three tests. What score does he need on his next test so that his average (mean) is 78?
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4 votes
Chris has scored 78, 61, and 91 on his previous three tests. What score does he need on his next test so that his average (mean) is 78?

User Georgy Grigoryev
by
8.0k points

1 Answer

6 votes
(78+61+91+x)/4=78
Rearrange So
(230+x)= 78 x 4
230 + x = 312
x = 312-230
X= 82
Chris need to score 82
User Nijeesh Joshy
by
8.8k points
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