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NCERT Class XII Mathematics Chapter - - Solutions

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Question : 81
Total: 101
In a box containing 100 bulbs, 10 are defective. The probability that out of a sample of 5 bulbs, none is defective is
Solution:  
p, the probability of defective bulb =
10
100
=
1
10

⇒q=1−
1
10
=
9
10
 and n=5
Now P(X=0)=5C0q5p0 =1×(
9
10
)5×1 =(
9
10
)5
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