Question 1177276
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Hi
Poisson Distribution:  0.5per minute 0r 2/4min 0r 4/8min  or 5/10min
Using Ti or similarly aa inexpensive calculator like a Casio fx-115 ES plus 
4 min
P(x = 1) = poissonpdf(mean, x-value)= poissonpdf( 2,1) = .2707
8min
P(x ≥ 2) = 1 - P(x ≤ 1) = 1 -  poissonpdf( 4,1) = 1- .0733 = .9267
10min
P(x ≤ 1) = = poissonpdf( 5,1) = .0337
Or
One may use the Equation: 
{{{P(x) = (mu^x/x!)*e^(-mu)}}}  

Wish You the Best in your Studies.
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