Answer:
See below.
Step-by-step explanation:
This is what the table has:
Gender Biology Chemistry Physics Total
Girl 42 39 23 104
Boy 45 32
Total
The total number of students is 200.
There are 104 girls. 200 - 104 = 96. There are 96 boys.
Also add all students who chose Chemistry: 39 + 45 = 84
Add all students who chose Physics: 23 + 32 = 55
Now we have this:
Gender Biology Chemistry Physics Total
Girl 42 39 23 104
Boy 45 32 96
Total 84 55 200
Add 45 and 32 and subtract from 96 to get boys who chose Biology.
96 - (45 + 32) = 96 - 77 = 19
Now add 42 and 19 to find the total of Biology.
42 + 19 = 61
The full table is below. The filled in numbers are in bold face.
Gender Biology Chemistry Physics Total
Girl 42 39 23 104
Boy 19 45 32 96
Total 61 84 55 200
