By law, a box of cereal labeled as containing 18 ounces must contain at least 18 ounces of cereal. the machine filling the boxes produces a distribution of fill weights with a mean equal to the setting on the machine and with a standard deviation equal to 0.02 ounce. to ensure that most of the boxes contain at least 18 ounces, the machine is set so that the mean fill per box is 18.06 ounces. assuming nothing is known about the shape of the distribution, what can be said about the proportion of cereal boxes that contain < 18 ounces.