M(n)=350/n. what is the practical domain? n is the number of people in a band

The pracical domain is no negatives
no zero

domain is all positive integers
depends on what M(n) is
if it is something like books, n can only be numbers that, are factors of 350 because you don't want poeple getting 3 and 3/4 book
 
if it is something like gallons of water, then n can by any positive number because people can have a fraction of water

Here for a good time of free question aha