Every laptop returned to a repair center is classified, Basic Statistics

Every laptop returned to a repair center is classified

Every laptop returned to a repair center is classified according its needed repairs: (1) LCD screen, (2) motherboard, (3) keyboard, or (4) other. A random broken laptop needs a type i repair with probability pi = 2^4-i /15. Let N_i equal the number of type i broken laptops returned on a day in which four laptops are returned.

(a) Find the joint PMF

(b) What is the probability that two laptops require LCD repairs?

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Basic Statistics: Every laptop returned to a repair center is classified

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Basic Statistics: Every laptop returned to a repair center is classified

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