Question

The probability distribution of a random variable is as follows:

p(x) = \(\frac{x+3}{10}\); x = – 2, 1, 2

Hence, calculate E (X²).

Answer 1

To calculate E(X²), the following table is prepared:

E(X²) = Σx² ∙ p(x) = \(\frac{28}{10}\) = 2.8

Hence, E(x²) obtained is 2.8.