Multiple choice

In a bag, there are 100 bulbs, out of which 30 are defective. A bulb is selected from the bag at random. What is the probability that the selected bulb is a good one?

  1. 0.50

  2. 0.70

  3. 0.30

  4. 0.10
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B Correct answer
Explanation

There are 100 total bulbs and 30 are defective, meaning 70 are good. The probability of selecting a good bulb is 70 / 100 = 0.70.

AI explanation

Using the classical definition of probability, the total number of outcomes is the 100 bulbs in the bag. The number of good bulbs is the total minus the defective ones, giving 100 - 30 = 70 favorable outcomes. The probability is calculated as 70/100, which equals 0.70.

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