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The average number of students getting help from tutors at any time before a final examination is 2.5 a)What is the probability that between 5

The average number of students getting help from tutors at any time before a final examination is 2.5 a)What is the probability that between 5 and 7 students are being attended to by tutors? b)How many tutors should be available to that there is not more than a 10% chance of a student having to wait

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