For a random variable X. If E(X) = 5 and V(X) = 6, then E(X²) is equal to?

Solution:

Variance (σ²) is the squared variation of values (X_i) of a random variable (X) from its mean (μ) .

The variance formula lets us measure this spread from the mean of the random variable.

The variance formula is different for a population and a sample. 

Given that:

E(X) = 5 and V(X) = 6

We have:

V(X) = E(X²) - [E(X)]²

6 = E(X²) - 5²

E(X²) = 6 + 25

= 31

For a random variable X. If E(X) = 5 and V(X) = 6, then E(X²) is equal to?

Summary:

For a random variable X., If E(X) = 5 and V(X)=6, then E(X²) is equal to 31. Variance (σ²) is the squared variation of values (X_i) of a random variable (X) from its mean (μ) .