Construct a Frequency Distribution with a class interval of 10, starting with 30.

The caffeine content of 20 brands of regular coffe is shown below.
80  82  89  85  87
30  33  44  40  46
50  55  60  62  71
90  92  75  63  65
Construct a Frequency Distribution with a class interval of 10, starting with 30. Show the class limits, class boundaries, class midpoints, class frequencies and class cumulative less than frequencies.