A packing machine is set to fill a cardboard bow with a mean average of 16.1 ounces of cereal. Suppose the amounts per box form a normal distribution with standard deviation equal to 0.04 ounce.

a. what percent of boxes will end up with at least 1 pound of cereal?

b. Ten percent of the boxes will contain more than what number of ounces?

c. Eighty percent of the boxes will contain more than what number of ounces?

d. the middle of 90% of the boxes will be between what two weights?