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Please show me step by step explanation thanks! 5. A class of 11 students takes a test in which each student gets an A with

Please show me step by step explanation thanks!

5. A class of 11 students takes a test in which each student gets an A with probability p, a B with probability q, and a grade below B with probability 1 7 p 7 :3, independently of any other student, where 0

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