Probability That Exactly 1 is Defective in Getting 2 Cell Phones Date of Exam November 2016 Subject Mathematics, Surveying and Transportation Engineering Problem A box contains 5 defective and 195 non-defective cell phones. A quality control engineer selects 2 cell phones at random without replacement. What is the probability that exactly 1 is defective? A. 0.0190 C. 0.0390 B. 0.0490 D. 0.0290 Answer Key Click here to show or hide the Answer Key [ B ] Solution Click here to expand or collapse this section $P = \left( \dfrac{5}{200} \times \dfrac{195}{199} \right)(2)$ $P = 0.0490$ Another Solution $P = \dfrac{(^5C_1)(^{195}C_1)}{^{200}C_2}$ $P = 0.0490$ Category Probability Dependent Events Defective Cell Phone Log in or register to post comments