Answer
5.3 kg, or about 12 pounds.
Work Step by Step
Looking at table 15–2, we see that if, every day one hour of sleeping is replaced by light activity, the person will burn an additional energy, in joules, of (230W-70W)(3600 s).
Calculate the mass lost in 365 days.
$$M=(160\frac{J}{s})(3600s)(365)\frac{1kg\;fat}{4\times 10^7J}\approx5.3kg$$
This is a weight of about 12 pounds.
