Hi

p = .75 , n = 5

P(x ≥  4) = P(4)+P(5)  0r = 1 - binompdf(5, .75,3)= .6328



Using  

p and q are the probabilities of success and failure respectively. 

In this case p= .75, q = .25  and n = 5

 

P(4)+P(5) = 5C4(.75)^4(.25)^1 + 5C5(.75)^5(.25)^0 

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