Question: A manufacturer of Brass ornaments checks the purity of the brass (a mixture of copper and zinc) from the supplier by weighing a specified volume of the material. If the mixture contains an acceptable combination of copper and zinc the weight of one liter will vary from the specific weight W by less than one ounce. To speed up the process of checking the material 30 liters are weighed at one time. What are the acceptable weight limits for the 30 liters of material?