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 ≥ 3)

Bionomial Probability:  p(late) = .40  and q = .60 ,  n = 5

P(x ≥ 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 ≥ 3) = 1 – P(x ≤ 2) = 1 - binomcdf(5, .40, 2)

or an Excel function can be used as well:  1-BINOMDIST(2,5,0.40,TRUE) 

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