Question

Suppose that 10% of a certain batch of calculators have a defective case, and that 18% have defective batteries. Also, 6% have both a defective case and defective batteries. A calculator is selected from the batch at random. Find the probability that the calculator has a good case and good batteries. The probability that the calculator has a good case and good batteries is (Type an integer or a decimal.)

Answer 1

8 Let A becurnt that calculator has difective case oto B be event that coliulator has defective baftery. 9 10 P(A) = P ( calculator has defective case) 10 11 11 P(B): 81 calculator has defective battery) 12 =0:18 12 1 PlanB): 0.06 2 3 3 PlÃO B)= Pl calculator has has a good case and d case ond good batteries I-PLAUB) Booleather 4 4 5 6 PLAUB): PlA) + P (B) PCARB 0:10 +0:18 - O'O 6 0.22 Plan B) = (-0-22 0.78 0.8 Cone decimal round oft) Plcallalator hasa a good Case on di agood batte -0-78 0.8 019