Set the base the Random # on the # of players in your Party Sheet?
It is often helpful to have a fixed set of enemies per player. If you wanted to have 3 goblins for each player in the party, you could use the following syntax: 3*$PC
Note that this requires that you have player characters added to the Party Sheet. If you have 5 players in your campaign, it will automatically add 3 x 5 = 15 goblins to the encounter. If you want a random # to appear for each player, then you can combine this with earlier random syntax. For example, 1d4*$PC would create 1 to 4 for each party member.