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Alan has scored 99, 85, and 74 on his previous three tests. What score does he need on his next test so that his average (mean) is 83?
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Alan has scored 99, 85, and 74 on his previous three tests. What score does he need on his next test so that his average (mean) is 83?

User Daniel Sklenitzka
by
4.9k points

1 Answer

2 votes
(99+85+74+x)/4=83
multiply both by 4
99+85+74+x= 332
258+x=332
subtract 258 both sides
x= 74

He must get a 74.

To check answer:
99+85+74+74= 332
332/4 = 83

It’s right!

Hope it helps
User Venederis
by
5.1k points
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