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Q.

In a book of 500 pages it is found that there are 250 typing errors. Assume that poission law holds for the number of errors per page. Then the probability that a random sample of 2 pages will contain no error is

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a

e−0.3

b

e−0.5

c

e−1

d

e−2

answer is C.

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Detailed Solution

λ=250500=12 P(X=0)=e−12 Required probability=P(X=0).P(X=0)                                           =e−12.e−12                                           =e−1
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