We would be talking about weighted mean and sample variance, if you calculated them from the data, but in here you are talking about properties of random variable and it's expected value and variance. Notice that this has nothing to do with calculating weighted means and bothering with them, this is simply about applying the definitions of expected value and variance. Since this seem to be a homework question, let me give you a hint.įrom your description, you are dealing with a random variable $X \in \$ (expected value of $X$ squared). Expected value of sum of random variables calculator uses expectedvalueofsumofrandomvariables Expected value of X+
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