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const2013
9 days ago
13

A supplier delivers an order for 20 electric toothbrushes to a store. by accident, three of the electric toothbrushes are defect

ive. what is the probability that the first two electric toothbrushes sold will be returned because they are defective?
Mathematics
1 answer:
Leona [4.1K]9 days ago
3 0
Three out of twenty toothbrushes are defective, indicating an initial probability of picking one that is defective on the first attempt is 3/20. On the second attempt, because one defective toothbrush has already been removed, the remaining defective ones are 2 out of 19. To find the likelihood of both selections being defective, we multiply the two probabilities. Thus, (3/20)*(2/19) = 6/380, which simplifies to approximately 0.0157, or around 1.6%.
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