Grouped frequency tables are a way of showing data in groups. Set up a new column to write the midpoint of each class. Set up another column to multiply each midpoint by its frequency. Find the sum of ...

Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 47, No. 2 (1998), pp. 203-216 (14 pages) In the manufacture of metal fasteners in a progressive die operation, and other ...