Mean and Standard Deviation
AP Statistics · Flashcards · Recall
AP STATISTICS · FLASHCARDS
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QUESTION
What is the mean of a Poisson random variable with rate
lambda
\text{lambda}
lambda
?
QUESTION
What is the variance of
X
X
X
if
X
X
X
follows a normal distribution with variance
sigma
2
\text{sigma}^2
sigma
2
?
QUESTION
Identify the standard deviation of a Poisson random variable with rate
lambda
\text{lambda}
lambda
.
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ANSWER
Standard deviation is
sqrt(lambda)
\text{sqrt(lambda)}
sqrt(lambda)
. Poisson standard deviation is square root of rate parameter.
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