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Exercise
May 05'23
Answer
Solution: D
With no tornadoes in County P the probabilities of 0, 1, 2, and 3 tornadoes in County Q are 12/25, 6/25, 5/25, and 2/25 respectively. The mean is (0 + 6 + 10 + 6)/25 = 22/25. The second moment is (0 + 6 + 20 + 18)/25 = 44/25. The variance is 44/25 – (22/25)2 = 0.9856.
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