Question

In a Poisson distribution, the probability mass function is given by: \(\rho(x) = \frac{e^{-2}(2)^3}{3!},\) the mean value is:

• A. 4
• B. 3
• C. 2
• D. 1

Hint:

In a Poisson distribution, the mean and variance are both equal to λ.

Answer 1

The Correct Option is C

In a Poisson distribution, \( \lambda \) denotes the mean, with \( \lambda = 2 \) in this case.

The mean value is therefore \( 2 \). Hence, option (c) is the correct answer.