Given:
A life insurance company has determined that each week an average
of seven claims is filed in its Nashville branch
It follows poison distribution with mean (λ) = 7
Probability function of poison distribution = (e-λ λx)/x!
probability that during the next week exactly seven claims will be filed is P(x=7) = (e-7 77)/7! = 0.149
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probability that during the next week no claims will be filed is P(x=0) = 0.0009
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probability that during the next week fewer than four claims
will be filed is P(x<4) =0.0817
probability that during the next week at least seventeen claims will be filed is P(X>=17)= 1-P(x<=16) = 1-0.999
= 0.001
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