The probability of earning a score of 90 on this test is 20%,the probability of earning a score of 80 is 60%,and the probability of earning a score of 70 is 20%.The correct formula for the expected value of this test is thus
A) (0.2) (90) + (0.6) (80) + (0.2) (70) .
B) (20) (90) + (60) (80) + (20) (70) .
C) (90 + 80 + 70) /3.
D) (0.33) (90) + (0.33) (80) + (0.33) (70) .
E) unknown.
Correct Answer:
Verified
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