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Let X be a random variable with the following probability distribution:
Value x of X P (X = x) 30 0.05 40 0.10 50 0.10 60 0.75
And the expectation E (X) and variance Var (X) of X. (If necessary, consult a hat of formulas )
E(x) = Al
Var (X) = 9
x 6 ?
9n
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