Question

How to find mean and variance for probability density?

Answer 1

Answer:

Variance: Var(X)

To calculate the Variance: square each value and multiply by its probability. sum them up and we get Σx2p. then subtract the square of the Expected Value μ

Answer 2

Answer:

Hey mate its not density it is distribution,

To find the variance of a discrete probability distribution, find each deviation from its expected value, square it, multiply it by its probability, and add the products. To find the standard deviation σ of a probability distribution, simply take the square root of variance .