Probability and Statistics

For a Poisson distribution with parameter $\lambda$, the mean and variance are:

Options:

• (A) Both equal to $\lambda$
• (B) Mean = $\lambda$, Variance = $\lambda^2$
• (C) Mean = $\lambda$, Variance = $\sqrt{\lambda}$
• (D) Mean = $\lambda^2$, Variance = $\lambda$