Question 665067
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Hi,
A student is known to arrive late for a class 40% of the time. 
If the class meets five times each week find the P(x &#8805; 3)
Bionomial Probability:  p(late) = .40  and q = .60 ,  n = 5
P(x &#8805; 3) = P(x=3) + P(x=4)+ P(x=5)
         = 5C3(.40)^2(.60)^2  + 5C4(.40)^4(.60)^1  + 5C5(.40)^5

Using TI function: P(x &#8805; 3) = 1 – P(x &#8804; 2) = 1 - binomcdf(5, .40, 2)
or an Excel function can be used as well:  1-BINOMDIST(2,5,0.40,TRUE)