Proportional Predictions: How to Use Proportions to Estimate Population Size
To estimate a population from a sample, set up a proportion: the ratio in the sample equals the ratio in the whole population. Capture-recapture problems use exactly this. The steps below work through a full example, followed by more examples and practice problems. Today, we’ll be talking about an incredibly practical use of math, using […]
How to Find Missing Angles of Triangles
To find a missing interior angle of a triangle, add the two known angles and subtract their sum from 180°. For example, if two angles are 45° and 56°, the third is 180° − 101° = 79°. All three interior angles must add to 180°.
