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Q.

Five coins are tossed 800 times. The probability of getting 2 heads 3 times, by using poisson distribution, is

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a

e−250(250)33!

b

300.e–3002

c

3002.e–300

d

300e–2

answer is A.

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Detailed Solution

λ=800.5C225 =800.1032=250 p(X=3)=e−250(250)33!
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Five coins are tossed 800 times. The probability of getting 2 heads 3 times, by using poisson distribution, is