The following table shows the number of students who did not attend statistics class over the 30 class meetings last semester. What is the expected number of absent students per class for the next semester?
A) 2.123
B) 1.800
C) 1.965
D) 1.246

Question

The following table shows the number of students who did not attend statistics class over the 30 class meetings last semester.  What is the expected number of absent students per class for the next semester?
A) 2.123 
B) 1.800 
C) 1.965 
D) 1.246

Quizplus · Accepted Answer

The expected value of the number of absent students per class can be calculated by taking the average of the number of absent students over the 30 class meetings. Therefore, (87+57+31+18+20+25+35+28+26+31)/30 = 1.8. Therefore, the best choice is B.

The Following Table Shows the Number of Students Who Did