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a factory produces lightbulb. testing shows that every 1000 lightbulbs tested, 7 are defective. estimate the probability that a bulb chosen at random will be defective.
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a factory produces lightbulb. testing shows that every 1000 lightbulbs tested, 7 are defective. estimate the probability that a bulb chosen at random will be defective.

User Illiax
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The probability that the light bulb will be defective is 7/1000 or 0.007 or 0.7%. Probability is the number of favorable outcomes (in this case 7) over the number of total outcomes (in this case 1000).
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