stratified sampling
representative sampling
proportional sampling

They are hardly a representative sampling of the city force.

About 250 artists from all over the country compete for 80 spaces in which to show a representative sampling of their work.

You are not a representative sampling of the population.

The test, which is given to a representative sampling of American students, has been in existence for more than 25 years.

I have an itinerary that should provide you a representative sampling of its biology.

Here is a representative sampling of community organizations, listed by category, that have done something about their problems.

There is a representative sampling of trains, but they are not a specialty here.

The following list is a representative sampling of institutions that open their doors to tourists and students.

Another matter: We do not have a representative sampling here.

"I shall be delighted to provide you with a representative sampling, Major."