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$A$ is a random variable whose mean is $71.2$ and whose standard deviation is $1.1$.
$B$ is a random variable whose mean is $23.7$ and whose standard deviation is $0.25$.

If $A$ and $B$ are independent, what is the variance of $A-B$?

A

$0.0625$

B

$1.2100$

C

$1.1475$

D

$1.2725$

E

$1.3500$

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