medium · GMAT Quant
A set of five numbers is 4, 8, 8, 12, 18, which has a mean of 10. A sixth number, equal to the set's mean, is added to form a new set of six numbers.
What is the variance of the new six-number set?
- (112)/(5)
- (28)/(3)
- (56)/(3)
- (56)/(5)
- √((56)/(3))
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