Suppose X is a discrete random variable whose probability distribution function f(x) is given by the following table. Find the expected value, E(X), of X. Round to 4 decimal places if needed. x f(x) -2 -1 0 1 0.1 0.2 0.3 0.4

The probability distribution for the number of automobiles sold during a day (x) at Bob Iron Motors is as follows.   x f(x) 0 0.001 1 0.007 2 0.034 3 0.099 4 0.188 5   6 0.220 7 0.136 8 0.055 9 0.015 10 0.001   23 Suppose the gross profit per vehicle sold is  $1,820 .  The expected value of gross profit is, a $9,656.08                 b $9,560.48                 c $9,465.82                 d $9,372.10

Let X be a random variable with the following probability distribution. Value x of X P(X=x) 40 0.10 50 0.45 60 0.15 70 0.20 80 0.05 90 0.05 Find the expectation E(X) and variance Var(X) of X.

Let X be a random variable with the following probability distribution. Value  x  of  X P(X=x) 0 0.25 10 0.20 20 0.10 30 0.35 40 0.10 Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation  E (X) of X .   E(X)=   (b) Find the variance Var (X)of X.   Var (X)=