Moderate
The variance of 5 numbers is 10. If each number is divided by 2, then variance of new number is_____________?
Correct answer: C. 2.5
- A. 20
- B. 5
- C. 2.5
- D. 0
Explanation
Dividing every observation by 2 divides the standard deviation by 2 and the variance by its square, 2². Thus the new variance is 10/4 = 2.5.
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