試題詳解

12. A beer dispensing machine flls thousands of 12 ounce beers each day. The machine is very consistent but the pours do vary a little bit. Assume it is known that the distributions of pours is normally distributed with a mean of 12.1 ounces and a standard deviation of .05 ounces. Customers get very angry when their beers have less than the advcrtised 12 ounces of beer in them. Find the proportion of the customers that could get angry because of this reason.
(A).4772
(B).9772
(C).0.228
(D).5228 1.040