The sum of a number is 1214 base 5. What is the average expressed in base 5?

Answer 1

I do not understand. You can not find the sum of one number.
Perhaps you mean the sum and average of several numbers, but if so we need to know them to find the average.
Anyway if you want to convert that number to base ten it is:
1*5^3 + 2*5^2 + 1*5^1 + 4*5^0
= 125 + 50 + 5 + 4