Statisticsmedium · Past Paper
If the mean of 6, 8, 5, 7, x and 4 is 7, then x is:
A12
B10
C8
D14
✓ Correct Answer: A — 12
Sum = 30+x. Mean = (30+x)/6 = 7 $\Rightarrow$ 30+x = 42 $\Rightarrow$ x = 12.
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