Question

Suppose that X is the number of cars per minute that pass through a certain intersection, and that X has the poisson distribution. If the mean of X is equal to 9 cars, what is the variance of X

Answer 1

The variance of a distribution is the square of the standard deviation

The variance of the data is 9

How to determine the variance

The given parameters are:

Mean = 9 cars

Distribution type = Poisson distribution

The variance and the mean of a Poisson distribution are equal.

So, we have:

Variance = 9 cars

Hence, the variance of the data is 9

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