hester Butcheries proudly provide quality meat through its growing retail footprint in Kwa-Zulu Natal, Gauteng and the Eastern Cape. A meat packer is investigating the marked mass shown on vienna sausages. A pilot study showed a mean of 15.8kg per pack and a variance of 0.64kg. How many packs should be sampled in order to be 98.5% confident that the sample mean will differ by at most 0.31kg? (5)