No it isn't A.
First, we get the total or sum of the four test scores by multiplying the mean by 4:
85 * 4 = 340
Then, we subtract this by the sum of the other three given test scores to find the fourth:
340 - (81 + 83 + 85) = ?
hope this helps~ `u`
The mean of a set of four test scores is 85. If three of the test scores are 81,83, and 85, what is the fourth test score?
A. 89
B. 87
C. 91
D. 85
Is the answer A?
Thank you
4 answers
Oh ok thank you.
176
91