question archive There are 100 counties in a particular state

Subject:StatisticsPrice:2.86 Bought3

There are 100 counties in a particular state. The average number of traffic accidents per week is four for each county. Find an approximation to the probability that there are more than 450 traffic accidents in the state in one week.

Result should be 0.58, not 0.62. Please give specific explainations.

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