Every laptop returned to a repair center is classified according its needed reparis: (1) LCD screen, (2) motherboard, (3) keyboard, or (4) other. A rondom broken laptop needs a type i repair with probability pi = 24-i/15. Let Ni equal the nuber of type i broken laptops reurned on a day in which four laptops are returned. a) Finde the joint PMF of N1, N2, N3, N4 b) What is the probability that two laptops require LCD repairs? c) What is the probability that more laptops require motherboard repairs that kedyboard repairs?

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