Question

On a typical quiz, 10% of the class scores 4 points, 20% scores 3 points, 50% scores 2 points, 15% scores 1 point, and 5% scores 0 points.

What is the expected value of a typical quiz score?
A)2.00
B)2.15
C)2.05
D)2.10

Answer 1

2.15

Explanation:

convert percentages to decimal

e.g.

10% = .10

EQUATION:

(4)(.10)+(3)(.20)+(2)(.50)+(1)(.15)+(0)(.5) = 2.15