Question: An accident study shows that a month may be considered as high, medium, or low accidents month with probabilities 0.2,0.3 and 0.6 respectively. The number

An accident study shows that a month may be considered as high, medium, or low accidents month with probabilities 0.2,0.3 and 0.6 respectively. The number of accidents follow Poisson distributions with means 20, 15 and 10 respectively.

The variance of the number of accidents is :-

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