SOLVED:(a) construct a discrete probability distribution for the random variable X [Hint: .P(xi)=(fi)/(N)], (b) draw a graph of the probability distribution, (c) compute and interpret the mean of the random variable X, and (d) compute the standard deviation of the random variable X. Ideal Number of Children What is the ideal number of children to have in a family? The following data represent the ideal number of children for a random sample of 900 adult Americans. x (number of children)

Probability with discrete random variable example

SOLVED:A discrete probability distribution for a random variable X is given. Use the given distribution to find (a) P(X ≥2) and (b) E(X). xi 1 2 3 4 pi 0.4 0.2 0.2 0.2