Suppose X is a random variable with mean 10 and variance 16. Suppose Y is a random variable with mean 20 and variance 9. X and Y are independent. What is the standard deviation of the difference X -...


Suppose X is a random variable with mean 10 and variance 16.<br>Suppose Y is a random variable with mean 20 and variance 9.<br>X and Y are independent.<br>What is the standard deviation of the difference X - Y?<br>square root of 7<br>25<br>5<br>None of the other choices is correct<br>7<br>

Extracted text: Suppose X is a random variable with mean 10 and variance 16. Suppose Y is a random variable with mean 20 and variance 9. X and Y are independent. What is the standard deviation of the difference X - Y? square root of 7 25 5 None of the other choices is correct 7

Jun 11, 2022
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