In a binomial distribution with trials and probability of success , what is the standard deviation ?
Answer and explanation
Correct answer: B.
- Step 1: The variance of a binomial distribution is .
- Step 2: Here , , and .
- Step 3: Calculate variance: .
- Step 4: Take the square root to find standard deviation: .
Answer
.
Why not the others: '' is the expected mean ; '' is the variance , not the standard deviation; '' is .
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