Three companies A, B and C supply 25%, 35% and 40% of the notebooks to a school. Past experience shows that 5%, 4% and 2% of the notebooks produced by these companies are defective. If a notebook was found to be defective, what is the probability that the notebook was supplied by A?

13 ‚Äö√Ñ√∂‚àö√ñ‚àö√´ 24

44‚Äö√Ñ√∂‚àö√ñ‚àö√´69

25‚Äö√Ñ√∂‚àö√ñ‚àö√´69

13‚Äö√Ñ√∂‚àö√ñ‚àö√´24

11‚Äö√Ñ√∂‚àö√ñ‚àö√´24

Three companies A, B and C supply 25%, 35% and 40% of the notebooks to

1.	Three companies A, B and C supply 25%, 35% and 40% of the notebooks to a school. Past experience shows that 5%, 4% and 2% of the notebooks produced by these companies are defective. If a notebook was found to be defective, what is the probability that the notebook was supplied by A?
A.	<sup>44</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>69</sub>
B.	<sup>25</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>69</sub>
C.	<sup>13</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>24</sub>
D.	<sup>11</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>24</sub>
Answer» C. <sup>13</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>24</sub>

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Three companies A, B and C supply 25%, 35% and 40% of the notebooks to a school. Past experience shows that 5%, 4% and 2% of the notebooks produced by these companies are defective. If a notebook was found to be defective, what is the probability that the notebook was supplied by A?

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