Of the articles from a certain production line, $10$% are defective. If a sample of $25$ article

Question

Of the articles from a certain production line, $10$% are defective. If a sample of $25$ articles is taken, find the expected number of defective articles and the standard deviation.

Accepted Answer

Expected number $2.5$; standard deviation $1.5$, under the independent constant-probability sampling model.

Expected value and variance of binomial distribution

Expected value and variance of binomial distribution

Solution:

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