Statisticshard · Past Paper
If the mean of $a, b, c, d, e$ is 28, and the mean of $a, c, e$ is 24, what is the mean of $b, d$?
A34
B32
C30
D36
✓ Correct Answer: A — 34
a+b+c+d+e = 140. a+c+e = 72. So b+d = 140 - 72 = 68. Mean of b,d = 68/2 = 34.
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