Suppose that a pair of random variables have the same ...

(B)The expected value of is and the variance of is . If Xi's are normally distributed then . is also normally distributed with the mean n( and the variance . has a standard normal distribution with the mean 0 and the variance 1 (C)If h(x) is a linear combination of Xi’s then the mean of h(x) is and the variance of h(x) is . ................
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