Question #333644

the probability of observing defective item in a lot is 0.01.suppose 25 items are inspected from the lot,what is the probability that not more than 3 defective are found, exactly 4 defective are found.(max 1024)


1
Expert's answer
2022-04-26T13:26:22-0400

Let X=X= the number of defective items: XBin(n,p).X\sim Bin (n, p).

Given p=0.01,q=1p=0.99,n=25.p=0.01, q=1-p=0.99, n=25.


P(X3)=P(X=0)+P(X=1)P(X\le3)=P(X=0)+P(X=1)

+P(X=2)+P(X=3)+P(X=2)+P(X=3)

=(250)(0.01)0(0.99)250+(251)(0.01)1(0.99)251=\dbinom{25}{0}(0.01)^0(0.99)^{25-0}+\dbinom{25}{1}(0.01)^1(0.99)^{25-1}

+(252)(0.01)2(0.99)252+(253)(0.01)3(0.99)253+\dbinom{25}{2}(0.01)^2(0.99)^{25-2}+\dbinom{25}{3}(0.01)^3(0.99)^{25-3}

=0.99989307347=0.99989307347

P(X=4)=(254)(0.01)4(0.99)254P(X=4)=\dbinom{25}{4}(0.01)^4(0.99)^{25-4}

=0.00010243058=0.00010243058


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