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In a newspaper ad a car dealer lists a 2001

In a newspaper ad, a car dealer lists a 2001 Chrysler, a 2010 Ford, and a 2008 Buick. If the numbers of inquiries he will get about these cars may be regarded as independent random variables having Poisson distributions with the parameters λ1 = 3.6, λ2 = 5.8, and λ3 = 4.6, what are the probabilities that altogether he will receive

(a) Fewer than 10 inquiries about these cars;

(b) Anywhere from 15 to 20 inquiries about these cars;

(c) At least 18 inquiries about these cars?

(a) Fewer than 10 inquiries about these cars;

(b) Anywhere from 15 to 20 inquiries about these cars;

(c) At least 18 inquiries about these cars?

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