Answer:
On an average the number of points that a student will score is:
-0.2
Step-by-step explanation:
The probability of choosing a correct answer = 1/5
( Since out of the 5 choices we have just one correct answer)
The probability of choosing a wrong answer = 4/5
( Since out of the 5 choices only one is correct and 4 are incorrect)
Scores received on correct answer = +3
Scores received on wrong answer = -1
The average scores, in long run will be equal to the expected value. The expected value E, in this case will be:
Thus, in long run, the student will score -0.2 points on average.