Q18: Studies have shown that X, the number of refrigerators sold per week has the following probability distribution 4 0.45 10 0.02 f(x) 0.05 0.18 The mean of X is equal to (A)2.0 (B) 4.0 (C) 2.5 (D) 3.5 (E) Cannot be found

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A: Use the substitution and solve the integral easily.

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A: Solution:-