Test 1 sec 4 #27 please!

Sure thing. To get this one right, you need to recognize that a field measuring 10 meters by 10 meters has an area of 100 square meters.

So when the ten students go off an dig up plots that are 1 meter by 1 meter (a.k.a. 1 square meter) they are taking a sample of 10 square meters out of 100. Each student is sampling 1/100 of the field!

The answer choices tell us without us having to do any real math that the samples average to about 150 worms per sample. So if the average sample yields 150 worms, then you’d assume the whole field has roughly 100 times that amount, or 15,000.