SOLUTION: A salesperson has a 20% chance of making a sale to any customer who is called upon. If 6 calls are made, what is the probability that A- three sales are made? B- at least one sal

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Question 948106: A salesperson has a 20% chance of making a sale to any customer who is called upon. If 6 calls are made, what is the probability that
A- three sales are made?
B- at least one sale is made?
C- Find the mean of the distribution
D-find the standard deviation of the distriubtion
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A salesperson has a 20% chance of making a sale to any customer who is called upon. If 6 calls are made, what is the probability that
A- three sales are made?
P(x = 3) = 6C3*0.2^3*0.8^3 = binompdf(6,0.2,3) =
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B- at least one sale is made?
P(1<= x <=6) = 1 - P(x = 0) = 1 - 0.8^6 =
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C- Find the mean of the distribution
u = np = 6*0.2 = 1.2
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D-find the standard deviation of the distriubtion
std = sqrt(npq) = sqrt(1.2*0.8) = 0.979
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Cheers,
Stan H.
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