One bulb is to be selected at random from a box of 80 bulbs

题目

One bulb is to be selected at random from a box of 80 bulbs. Probability that the bulb selected will be defective is 5/8 , and the probability that the selected bulb will be defective and rejected is 3/16. All bulbs not rejected are sold

Quantity A

The number of vdefective bulbs sold from the box

Quantity B

选项

Quantity A is greater.

Quantity B is greater.

The two quantities are equal.

The relationship cannot be determined from the information given.

解析

被淘汰的灯泡总数：80 × (5/8) = 50 被淘汰且有缺陷的灯泡总数：80 × (3/16) = 15 这意味着在50个有缺陷的灯泡中，有15个被淘汰而未售出。因此，50 − 15 = 35个有缺陷的灯泡未被淘汰，最终被售出。 A项数值 = 35 = B项数值答案：C

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