Chris has determined that the probability of earning a 95 on the next economics test is 10%,the probability of earning an 85 is 40%,and the probability of earning a 75 is 50%.
Chris's expected test score is _______.

Question

Quizplus · Accepted Answer

To find Chris's expected test score, we multiply each possible score by its respective probability and add the products together. 
Expected score = (0.10 x 95) + (0.40 x 85) + (0.50 x 75) 
Expected score = 9.5 + 34 + 37.5 
Expected score = 81

Chris Has Determined That the Probability of Earning a 95