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?
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
