Question

Wendy 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 4 7 7
Grade 10 9 11 5
Grade 11 12 13 5
Grade 12 10 5 12
If the principal randomly selects a student in grade 12 from this survey, what is the probability that the student is in favor of extending the school day?

Answers:
0.37
0.27
0.49
0.52

Answer 1

If the principal randomly selects a student in grade 12 so this means we focus on just the "grade 12" row. No other rows will be looked at here what is the probability that the student is in favor of extending the school day?" find the number in favor (who also happen to be in grade 12) then divide that number by the total number in grade 12  make sense.          

so it would be .37