Hello, can you please explain number 27 section 4 test 1?

Yeah, this is a really tricky one. The key to getting it right is recognizing just how much of the field the students are NOT covering! In a 10 ft by 10 ft field, there will be 100 1 ft by 1 ft squares. Look, below is a 10 by 10 grid with X’s marking places where the 10 students in this question might be.

The data in the table tells us that, on average, there are about 150 worms in each of the small boxes. Since there are 100 small boxes in the big field, we need to multiply 150 by 100 to get our answer for the approximate number of earthworms in the whole field.

150(100) = 15,000