Statisticshard · Past Paper
If the mean of 2, 3, x, 7, 8 is x, then x is:
A5
B4
C6
D7
✓ Correct Answer: A — 5
Sum = 20+x. Mean = (20+x)/5 = x $\Rightarrow$ 20+x = 5x $\Rightarrow$ 4x = 20 $\Rightarrow$ x = 5.
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