Variance Computation & Transformations

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1.
The SD of a set of observations is 8. If each observation is multiplied by 3, new SD is:
2.
The variance of a dataset is 16. Each observation is increased by 4 and then doubled. New variance is:
3.
If variance of {a, b, c, d} is V, the variance of {a+2, b+2, c+2, d+2} is:
4.
The variance of {2a, 2b, 2c} if variance of {a, b, c} is sigma^2:
5.
For 6 observations, sum(xi)=30, sum(xi^2)=200. Variance is:

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