a machine makes sticks of butter whose average weight is 4.0 ounces; the sd of the weights is 0.05 ounces. there is no trend or pattern in the data. there are 4 sticks to a package. a) a package weighs -, give or take or so. b) a store buys 100 packages. estimate the chance that they get 100 pounds of butter, to within 2 ounces.