Average =$332.00 / 144 = $2.30555. The average purchase price of $2.3555 can be viewed as a weighted average of the three purchase prices. This average is closer to $2 than $3 because more lumber was bought at the lower prices than the higher prices. The majority of performance metrics are ratios of one kind or another.
The terrestrial planets. From left to right: Mercury, Venus, Earth, and Mars. A terrestrial planet is mostly made of rock (silicate) Earth is the original terrestrial planet. When astronomers started understanding the kinds of planet they extended the term to include our nearest rocky neighbours: Mercury, Venus and Mars. It is often said that they are similar to Earth.
Non-terrestrial planets. Not all planets are terrestrial. In our solar system, Jupiter, Saturn, Uranus and Neptune are gas giants, also known as jovian planets. It's unclear what the dividing line is between a rocky planet and a terrestrial planet; some super-Earths may have a liquid surface, for example.