Question 813322
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Hi,
50% chance of making a sale to any customer called upon.
4 calls made
averages 2 sales per 4 calls, P(&#8805; 2)
Poisson Distribution
P(x &#956;) = {{{ (e^(-u)*u^x)/x!}}} 
P(&#8805; 2) =  1 - P(0) - P(1)
P(0)={{{ (e^(-2)*2^0)/0!}}} = .1353
P(1)={{{ (e^(-2)*2^1)/1!}}} = .2707
P(&#8805;2) =  1 - P(0) - P(1) = 0.5940