Suppose the average PSAT math score is What is the average SAT math score? If X is a discrete random variable with meanthen the variance of X is.
If X and Y are independent random variables, then. Suppose the standard deviation for the PSAT math score is 1. What is the standard deviation for the SAT math score?
Suppose the standard deviation for the SAT math score is points, and the standard deviation for the SAT verbal score is points. What is the standard deviation for the combined SAT score?
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