How to use "average" in a sentence

If the woman was Catherine Eddowes, then the man was certainly Jack the Ripper: about thirty, of average height, with a small moustache and a cap with a peak.

The average gambler won't cancel other planned trips to Vegas

An ex-showgirl! Alexander refused to believe that a showgirl could be of more than average intelligence

In spite of its tremendous weight, it moved more smoothly and easily than an average door in an average house

The planet Mars, I need not remind the reader, goes around the sun at an average distance of 224,000,000 kilometres, and receives from the sun half of the light and heat that is received by this world