What’s a level 5 ranger's max hit points with a Constitution modifier of +2?
Is it hit die plus modifier?
Lvl 1 = 12
Lvl 2 = 24
Lvl 3 = 36
Lvl 4 = 48
Lvl 5 = 60
From the PHB (p. 90):
Hit Points at 1st Level: 10 + your Constitution modifier
Hit Points at Higher Levels: 1d10 (or 6) + your Constitution modifier per ranger level after 1st
So yes, based on just your hitdie rolls, the absolute maximum at level 5 would be 60, as you calculated. However the chance of that happening is pretty astronomical (.01% chance of getting a 10 on 4 consecutive d10 rolls). That's why it would appear to be a "bit high".