Hi,

Example of BIONOMIAL PROBABILITY DISTRIBUTION

Note: The probability of x successes in n trials is: 

P = nCx*  where p and q are the probabilities of success and failure respectively. 

In this case p(scout) = 2/5 & q = 3/5   and n = 8

nCx = 

8 boys be selected, so as to include 

P(x = 3) = 8C3(.4)^3(.6)^5

P(x ≥ 3) = 1- P(x≤ 2)= 1 - P(x=0) + P(x=1)+ P(x=2)

P(x ≤ 3) = P(x=0) + P(x=1)+ P(x=2)+ P(x=3) 

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