Sufia is preparing a report for next week's planning meeting and, based on the research, she assigns the following probabilities to next year's sales:

Scenario	Probability	Sales ($ Millions)
1	0.10	$16
2	0.25	$15
3	0.30	$14
4	0.35	$13

a. Find Sufia's expected value for next year's sales. b. Find the variance and standard deviation.