<PRE><B>Question 198605</B>
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.
Ans: 6C4(0.3)^4(0.7)^2) = 0.0595
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b) The probability of making no sales.
Ans: (0.7)^4 = 0.2401
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c) The probability of exactly making two sales.
Ans: 6C2(0.3)^2(0.7)^4 = 324135...
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d) The mean number of sales within the two-hour period.
mean = np = 6*0.3 = 1.8 sales
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Cheers,
Stan H.

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