No, your answer is not correct. There was a total of 484 students surveyed, so your grand total at the bottom needs to be 484.
The first section that you will want to complete is the girls. They have given you each of the breakdowns, so you just need to add them together for the total number of girls.
36+55+144 = 235 girls.
Next, you know that you have 484 students, and if 235 are girls then 249 are boys. (484-235=). Enter 249 for the total boys.
Now you know that you have 249 boys, 40 always wear glasses and 161 never do. In order to calculate how many sometimes do you need to subtract 40 and 161 from 249.
249 - 40 - 161 = 48 sometimes wear glasses.
Now, you just need to add up each of the columns at the bottom. The answers are 76,
103 and 305. When you total these number together you get 484, which is the total number of students.
