Answer: 77.68
Explanation: 77.682517
Well ok so how many sig figs are to the left of the decimal? 2
7 and 7.
We got two down, two more to go.
How many sig figs do we need? 4.
Ok, so 6 and 8 are sig figs because they are whole numbers and not zeros. We need 4 sig figs.
77.68! BUT hold on, we need to still round our answer.
We look to the right of the two and determine if we need to round and we don't. 2 is too low so we keep 68 the same.