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A transmission channel has a per digit error probability p=0.01.Calculate the probability of more than 1 error in 10 received digit using 1) Binomial 2) Poison Distribution
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written 5.1 years ago by | • modified 5.0 years ago |
1) Binomial distribution
Given $P=0.01\\q=1-p=0.99\\n=10$
$P(X=r)= nC_r \ p^r \ q^{n-r}$
$for \ P(X \gt1)=1-P(X\le1)$
i.e $1-P(X=0)-P(X=1)$
=$1-10 C_0 (0.01)^0(0.99)^{10-0}-10C_1(0.01)^1(0.99)^{10-1}$
= $1-10 C_0 (1)(0.99)^{10}-10C_1(0.01)^1(0.99)^9$
=$1-0.9044-0.09135$
$P(X\gt1)=0.00425$
2) Poison distribution
given ,m=n.p
m=10(0.01)
m=0.1
P(X=r)=$e^{-m} \frac{m^r}{r!}$
$P(X\gt 1)=1-P(X\lt 1)$
=$1-P(X=0)-P(X=1)$
=$1-e^{-0.1} \frac {(0.1)^0}{0!}-e^{-0.1} \frac{(0.1)^1}{1!} $
=$1-0.9048-0.0905$
$P(X\gt 1) =0.0047$