We were told that Mrs. Liang carry out a survey and was tabulated.
We are to find the percentage of Mrs. Liang students who spent 9 to 16 hours each week doing math home work.
From the table:
10 students spent 9 - 12 hours
3 students spent 13 - 16 hours
So, from 9 - 16 hours is the addition of the number of students at those times.
Number of students from 9 - 16 hours = 10 + 3 = 13.
Total number of students = 25
Therefore, the percentage of students from 9 - 16 hours is:
= 13 x 100
25
= 1300
25
= 52%
Therefore, the correct option is the third option which is 52%.