The following data show the average daily consumption of milk in litres of 50 families of a society. Prepare a frequency polygon.
2.2, 2.8, 2.3, 1.6, 2.1, 2.4, 1.7, 1.5, 3.0, 2.6, 2.4, 2.1, 1.9, 1.3, 1.2, 1.0, 2.8, 1.7, 1.8, 2.3, 1.8, 0.8, 1.5, 3.0, 2.5, 3.0, 2.5, 3.0, 1.7, 0.5, 1.7, 0.5, 1.5, 2.2, 1.2, 1.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 1.9, 1.8, 1.7, 1.6, 1.5, 1.4, 1.3, 1.2, 1.1, 1.0, 2.2.