GAUSS7 2012 Problem 22

A quiz has three questions, with each question worth one mark. If 20\% of the students got 0 questions correct, 5\% got 1 question correct, 40\% got 2 questions correct, and 35\% got all 3 questions correct, then the overall class mean (average) mark was

Answer Choices
A. 1.8
B. 1.9
C. 2
D. 2.1
E. 2.35