4 . The number of accidents occurs in the park X follows a Poisson distribution with mean 7 accidents per year .
( a ) Find the probability that there are more than 7 accidents in the park X in a particular year .
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( b ) Find the probability that there are not more than 2 accidents in the park X in a particular 3-month period .
[ 2 ] The number of accidents occurs in the other park Y follows the Poisson distribution with mean 0.5 accidents per month .
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( c ) Find the probability that there are 5 accidents in each park in a particular year . [ 2 ] www . seprodstore . com
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