Class intervals in a grouped frequency distribution are given as `4 – 11, 12 – 19, 20 – 27, 28 – 35, 36 – 43.` Write the next two class intervals.
Write the class boundaries of all classes

Answer

`{:("Class intervals",4-11,12-19,20-27,28-35,36-43,44,51,52-59),("Boundaries",35-11.5,11.5-19.5,19.5-27.5,27.5-35.5,35.5-43.5,43.5-51.5,51.5-59.5,):}`