Question

6. Four persons white their names on individual slips of paper and deposit the slips in a common box. Each of the four draws at random a slip from the box. Determine that probability of each person drawing his own name slip. If the probability that a communications system will have high fidelity is 0.81 and the probability that it will have high fidelity and selectivity is 0.18. What is the probability that a system with high fidelity will also huge high selectivity. In a bolt factory machines A, B and C manufacture respectively 30%, 30%, 40% of the total of their output 4, 5, 3 %5 are defective bolts. A bolt is drawn at random from the

Answer 1

② No of ways of choosing their own name slip=1 Total no of ways= 4! = 24 .. Required prob=4/24] @ A: System will have high fidelity B; p r selectivity Given P(A): 0.81, PlanB)0.18 P (High selectivity high fidelity)= P(Bla) - P(ANB)/P(A) = 0.18%.81-1279

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