To find the total number of sixth-grade students surveyed, we need to add the frequencies of the responses for each subject in the sixth grade.
From the table:
- Math: 53
- English: 47
- Science: 42
Now, we calculate the total number of sixth-grade students surveyed:
\[ \text{Total for 6th grade} = \text{Math} + \text{English} + \text{Science} = 53 + 47 + 42 \]
Calculating this:
\[ 53 + 47 = 100 \] \[ 100 + 42 = 142 \]
Thus, the total number of sixth-grade students surveyed is 142.