A chemical supply company currently has in stock 100-lb of a certain chemical, which it sells to customers in 5-lb lots. Let X = the number of lots ordered by a randomly chosen customer, and suppose that X has pmf: 2 3 4 P(x) .2 .3 .3 .2 Given E(X) = 2.5, compute o x. Express your answer using 3 decimal places (i.e., x.XXX).

3. The two functions a(x) = 1 – x and b(x) = 2 are graphed below, determine the following: a. For what values of x does a(x) = b(x)? b. For what value(s) of x is b(x) = 3? %3D c. For what values of x is a(x) > b(x)? d. For what values of x is a(x) – b(x) = 2? c. The average rate of change for a(x) and b(x) on [-3,3].