Ronnie took the first three statistics tests. His scores are the following: 60, 78, and 86....
Ronnie took the first three statistics tests. His scores are the following: 60, 78, and 86. Then, Ronnie took the fourth test. What was his score on the fourth test if his overall average is 79.5?
Homework Answers
Mean 
= 
X / n
Let M be the fourth test score.
Overall average
= ( 60 + 78 + 86 + M) / 4
79.5 = ( 60 + 78 + 86 + M) / 4
Solve for M
79.5 = (224 + M) / 4
M = 94
Forth test score = 94
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