Question

Annie wanted to understand whether students at her school were in favor of an extended school day. She surveyed some students and displayed the results in the table below:
In favor Opposed Undecided
Grade 9 8 4 7
Grade 10 10 9 10
Grade 11 5 18 8
Grade 12 9 5 16


If the principal randomly selects a student in grade 11 from this survey, what is the probability that the student is in favor of extending the school day?

0.05

0.16

0.29

0.50

Answer 1

In this problem, it is specified that the sample space is of Grade 11 that is equal to 5 + 18 + 8 equal to 31 students. The number of students that are in favor of the event is 5, hence the probability is 5/31 equal to 0.16. Answer is B