<PRE><B>Question 1075147</B>
We use the Poisson(P) Probability Distribution
:
The formula for P is
:
P(x;u) = (e^u) * (u^x) / x!, where e = 2.71828
: 
To solve the problem we need to calculate
:
P(0;3) + P(1;3) + P(2;3) = 0.05 + 0.15 + 0.22 = 0.42
:
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