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

                           In favor       Opposed       Undecided    Total
Grade 9                   4                 7                      7              18
Grade 10                 9               11                      5              25
Grade 11               12               13                      5              30
Grade 12           10                 5                     12              27
Total                      35              36                      29           100    

If the principal randomly selects a student in grade 12 from this survey, the probability that the student is in favor of extending the school day is 0.10 or 10%

Grade 12 and In favor is 10. 
Total population is 100.

10/100 = 0.10
0.10 x 100% = 10%

Your answer should be 1/3. i hope i could ! good luck : )