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Answer: The mean or expected value is

(0)(0.3164) + (1)(0.4219) + (2)(0.2109) + (3)(0.0469) + (4)(0.0039) = 1.000.

The variance is

(0)2

(0.3164) + (1)2 (0.4219) + (2)2

(0.2109) + (3)2 (0.0469) + (4)2

(0.0039) – (1.000)2 =1.750 – 1.000

= 0.750.

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