Find the variance of the data 7, 4, 5, 2, 7 (treat them as a whole population).
Answer and explanation
Correct answer: D.
- Step 1: Mean .
- Step 2: Variance .
Answer
.
Why not the others: : the sample variance (dividing by ) is calculated. : that is the mean. : it uses the mean of squares without subtracting the squared mean.
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