Question 198561: A telemarketer makes six phone calls per hour and is able to make a sale on 30% of these contacts. During the next two hours. Find:
a) The probability of exactly making four sales.
b) The probability of making no sales.
c) The probability of exactly making two sales.
d) The mean number of sales within the two-hour period.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The owner reports 20% of the customers entering the store will make a purchase of at least $50. Suppose 15 customers enter the store before 10am on a particular Saturday
a) How many of these customers would you expect to make a purchase of at least $50?
Ans: 0.20*15 = 3
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b) What is the probability exactly five of these customers make a purchase of at least $50?
Ans: 15C5(0.2)^5(0.8)^10 = 0.1032
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c) What is the probability at least five of these customers make a purchase of at least $50?
Ans 1 - binomcdf(15,0.2,4) = 0.16423....
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d) What is the probability at least one customers make a purchase of at least $50?
Ans: 1 - binomcdf(15,0.2,0) = 0.96482...
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Cheers,
Stan H.
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