Andy earns $62,000 a year at an accounting firm. each year, he receives a raise.

andy has determined that the probability that he receives a 10% raise is 0.5, the probability that he
earns a 5% raise is 0.4, and the probability that he earns a 2% raise is 0.1.

a competing company has offered andy a similar position for $68,000 a year. andy wonders if he
should take the new job or take his chances with his current job.

a) find the mathematical expectation of the dollar amount of his raise at his current job.