local television station sells 15-sec, 30 sec, and 60 sec advertising spots. Let x denote the length of a randomly selected commercial appearing on this station, and suppose that the probability distribution of x is given by the table below:

x	15	30	60
p ( x )	.1	.3	.6

(a) Find the average length for commercials appearing on this station.
? x = ..... sec

(b) If a 15-sec spot sells for $600, a 30-sec spot for $700, and a 60-sec spot for $1000, find the average amount paid for commercials appearing on this station. (Hint: Consider a new variable, y = cost, and then find the probability distribution and mean value of y .)
$ .......

Answer rating: 100% (QA)

a b Here time of sells is costant ... View the full answer