To receive credit you must show the intermediate results. Also note that it is an expected value (single) problem, not expected values (plural), so do not neglect the last step of summing the individual factors. Typical answer format: EV = 0.40 x $200 + 0.50 x $300 + 0.10 x $400 = $270.
The director of the school play recalls the size of the audience the last few years. With this information determine the number of persons expected to attend the next school play.
40%, 240 people
10%, 430 people
30%, 350 people
15%, 515 people
5%, 0 people