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Question

From a lot of 10 items containing 3 defectives, a sample of 4 items is drawn at random without replacement. The expected number of good items is

A
3
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B
2.8
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C
1.2
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D
1.8
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Solution

The correct option is B 2.8
Probability of good items = 7/10
Total number of items drawn =4
Expected number of good items = 47/10=2.8

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