The lifespans of tigers in a particular zoo are normally distributed. the average tiger lives 22.4 years; the
standard deviation is 2.7 years.
use the empirical rule (68 - 95 - 99.7%) to estimate the probability of a tiger living between 27.8 and 30.5
years.

Well, since 1 pound is 16 ounces, half of a pound is 8 ounces. It says in the question that 3 1/2 is the number being used(tell me if that is not clear) so your answer would be 3 pounds and 8 ounces. If you want it only in ounces, then you could do 16x3+8, which is 46 ounces.