The number in decimals, 0.0763 has 3 significant digits.As, digit 0 which is appearing before 7 has no significant value.
So, Number 0.0763 expressed in one significant figure= 0.078
Why i have written this, because the digit 7 is greater than 5 , so 763 will correspond to 800.
So, 0.0763 = 0.0800=0.08