OG详解-OG2 数学1 Q2

Choice C is correct. It’s given that 29 out of every 100 beads that the machine produces have a defect. It follows that if the machine produces  k  beads, then the number of beads that have a defect is29100​​k, for some constant k. If a bead produced by the machine will be selected at random, the probability of selecting a bead that has a defect is given by the number of beads with a defect, 29100​​k, divided by the number of beads produced by the machine,  k. Therefore, the probability of selecting a bead that has a defect is  29100​k​k​ or 29​100​ .
Choice A is incorrect and may result from conceptual or computational errors.
Choice B is incorrect and may result from conceptual or computational errors.
Choice D is incorrect and may result from conceptual or computational errors.