Question 678723
A used car salesperson estimates the probabilities for the number the number of cars sold in a week as follow- 
number—0, 1, 2 ,3,4,5 
Probability-.05,.20,.35,.25,.10,.05 
a) What is the probability for a given week that four or more cars will be sold?
P(4 or more sold) = P(4 sold) + p(5 sold) = 0.10 + 0.05 = 0.15
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b) Find the expected number of cars sold in a week 
Multiply each "number value" by its corresponding probability.
Add those 6 products to get the expected number sold
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c) What is the probability that the salesperson will sell more than 2 cars in a given week?
P(sell more than 2) = P(3)+P(4)+p(5) = 0.4
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d) For a period of 3 weeks, what is the probability that salesperson will sell more than 2 cars every week? 
Ans: 0.4^3 = 0.064
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Cheers,
Stan H.
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