SOLUTION: Lisa has scored
64
,
86
, and
84
on her previous three tests. What score does she need on her next test so that her average (mean) is
79
?
Algebra.Com
Question 996315: Lisa has scored
64
,
86
, and
84
on her previous three tests. What score does she need on her next test so that her average (mean) is
79
?
Found 2 solutions by rfer, Alan3354:
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
(64+86+84+x)/4=79
234+x=79*4
x=316-234
x=82
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Lisa has scored
64
,
86
, and
84
on her previous three tests. What score does she need on her next test so that her average (mean) is
79
?
===========
64 + 86 + 84 = 234
---
79*4 = 316
316 - 234 = what she needs.
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