The number of customers calling a call centre is, on average, 3 in 30 minutes. What is the probability that at least 1 customer calls in 11 minutes? (3 d.p.)

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A: Group 1Group 2EducationHigh SchoolBA or higherSample size361169Mean$19500$20500St.dev$3800$3900

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A: The question is about discrete probability distribution.Given :

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Q: None

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A: The Final answer is : i) a>0 and b>0                                    ii) a=0 or b=0…