The variance of 5 numbers is 10. If each number is divided by 2, then the variance of new numbers is______________?
Correct answer: C. 2.5
- A. 20
- B. 5
- C. 2.5
- D. 5.5
- E. 0
Explanation
Dividing every observation by 2 divides the standard deviation by 2 and the variance by 2²=4. The new variance is therefore 10/4=2.5.
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