Discrete Random Variables Quiz

A function that gives the probability that a discrete random variable is less than or equal to some value

A function that gives the probability that a discrete random variable is exactly equal to some value (correct)

A function that gives the probability that a discrete random variable is greater than or equal to some value

A function that gives the probability that a discrete random variable is between two values

$E(X) = \\sum_{i} x_iP(X=x_i)$ (correct)

$E(X) = \\frac{1}{n}\\sum_{i=1}^{n} x_i$

$E(X) = \\frac{1}{n}\\sum_{i=1}^{n} P(X=x_i)$

$E(X) = \\sum_{i} P(X=x_i)$

The range of the random variable's values

The average of the squared differences from the mean (correct)

The average of the absolute differences from the mean

The sum of the squared differences from the mean