SOLUTION: A sales person has 10 percent chance of making a sale to any customer who is called upon. If 20 calls are made, what is the chance that (i) fewer than three sales are made (ii) At

Question 824479: A sales person has 10 percent chance of making a sale to any customer who is called upon. If 20 calls are made, what is the chance that (i) fewer than three sales are made (ii) At least one sale is made (iii) More than five are made?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A sales person has 10 percent chance of making a sale to any customer who is called upon. If 20 calls are made,
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Binomial Problem with n = 20 and p(sale) = 0.1
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What is the chance that:
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(i) P(fewer than three sales are made)
= P(0<= x <=2)
= binomcdf(20,0.1,2)
= 0.6769
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(ii) P(At least one sale is made)
= 1 - P(x = 0)
= 1-0.9^20
= 0.8784
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(iii) P(More than five are made)
= P(6<= x <=20)
= 1-binomcdf(20,0.1,5)
= 0.0113
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Cheers,
Stan H.
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