The entire group being studied and from which samples are taken is called the?

Population

If you can measure each item in the population, then you are taking a census. Though usually, the population is too big to make such a study possible as there isn't enough time, money, etc. So often a sample is preferred. This is where inferential statistics comes in.

She should use 12/3 to measure

58 i think in 5 hours he makes $58