Probability question, math homework help

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A quality control inspector is checking a sample of lightbulbs for defects. The table summarizes the results. If one of these lightbulbs is selected at random, find the probability that the lightbulb is good, given that it is 20 watts. Wattage Good Defective Total 20 90 10 100 50 76 15 91 100 87 92 Total 253 30 283 ת) The probability is (Simplify your answer. Type an integer or a fraction.)
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The conditional probability P(light is good | light is 20 watt) = p(lig...

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