"typical size" is a correct and usable phrase in written English.
It is commonly used to describe the average or common size of something. Example: "The typical size of a watermelon is about 10 inches in diameter."
Wide rule is the typical size that schoolchildren use.
Typical size of the crystalline domains is 100-200 μm.
What is the typical size of a visible shooting star?
The Transporter offers a higher quality of sound from a typical size stereo component.
Or there could be some typical size for an earthquake, with both larger and smaller events relatively rare.
That gigabyte can accommodate the downloading of about 170 music files of typical size.
Each plant's entry includes a short description, typical size, cultivation advice and pictures.
The site, 1,868 square meters, is a typical size for the area.
The concept of scale considers the typical size and lifetime of a phenomenon.
Metropolitan Moving & Storage has a similar system, loading items into crates that store furniture for a typical size room.
The metal for the coins was cast as ingots, a typical size being 1/2 × 1 × 20 inches.
