SAT, 03.12.2021 18:40 groverparham3
A random variable x has a mean of 120 and a standard deviation of 15. A random variable y has a mean of 100 and a standard deviation of 9. If x and y are independent, approximately what is the standard deviation of x - y ?.
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A random variable x has a mean of 120 and a standard deviation of 15. A random variable y has a mean...
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