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OpenStudy (anonymous):
The standard deviation of a random variable is 7.20. If the random variable has 12 added to it and then is divided by 4, what is the new standard deviation? A)1.8 B)3.4 C)4.8 D)10.2 E)19.2
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OpenStudy (zarkon):
\[V(aX+b)=a^2\cdot V(X)\]
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