Question: For the variable X, it is known that E(2X 4) = 4, E(4X2 3) = 71. The variance of X equals (a) 72

For the variable X, it is known that E(2X − 4) = 4, E(4X2 − 3) = 71.

The variance of X equals

(a) 7∕2

(b) 1

(c) 55

(d) 21∕2 (e)5∕2

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