составлять в среднем

The size of the feed averages between 18 in. and 21 in. cube.

The honing time averages 1 minute.

Production of steam amounted to an average of 900,000 Ib per hour (or was 900,000 Ib per hour on the average).

Источник: Русско-английский научно-технический словарь на Gufo.me