SOLUTION: Records indicate that I will make a sale on 70% of my sales calls. If I call 4 potential clients, what is the probability that I make exactly three sales? What is the probability t

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Question 1177290: Records indicate that I will make a sale on 70% of my sales calls. If I call 4 potential clients, what is the probability that I make exactly three sales? What is the probability that I will make exactly four sales?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
Binomial distribution: p(sale) = .70   and q(no sale) = .30
n = 4
Using calculator:
P(x = 3) = binompdf(n, p, x-value) =  binompdf(4, .7, 3) = .4116
P(x = 4) = binompdf(4, .7, 4) = .2401
0r
By Hand:  P+%28x%29=+highlight_green%28nCx%29%28p%5Ex%29%28q%29%5E%28n-x%29+ 
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