Long description

This figure shows the JC Electrics Quarterly data of units sold, with columns labelled from left to right as: Generators, Class intervals, Lower limit of class interval, Upper limit of class interval. From top to bottom, the Generators column contains the values 7, 7, 7, 7, 8, 8, 9, 9, 9, 9, 9, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 14, 14, 15. The Class intervals column contains the values 7_8, 9_10, 11_12, 13_14, 15_16. The Lower limit of class interval contains the values 7, 9, 11, 13, 15; and the Upper limit of class interval contains the values 8, 10, 12, 14, 16.