A quality control inspector, is checking a sample of light bulbs for defects. The following table summarizes her findings. (Write your answer as a reduced fraction.) wattage Good Defective total 20 80 15 95 50 100 5 105 100 120 10 130 total 300 30 330   If one of these light bulbs is selected at random, find the probability that the light bulb is  i) Good given it is 100 watts  ii) Defective given it is 50 watts  iii) 100 watts given it is good  iv) 50 watts given it is defective

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A quality control inspector, is checking a sample of light bulbs for defects. The following table summarizes her findings. (Write your answer as a reduced fraction.)

wattage

Good

Defective

total

20

80

15

95

50

100

5

105

100

120

10

130

total

300

30

330

 

If one of these light bulbs is selected at random, find the probability that the light bulb is 

  1. i) Good given it is 100 watts 
  2. ii) Defective given it is 50 watts 

iii) 100 watts given it is good 

  1. iv) 50 watts given it is defective
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