Question

Construct the relative frequency distribution for the 400 incomes listed in the table then construct a relative frequency histogram.

Incomes	Frequency	Relative Frequency
101 - 200	110
201 - 300	90
301 - 400	100
401 - 500	30
501 - 600	70

Answer 1

So,

Incomes	Class boundary	Frequency	relative frequency
101-200	100.5-200.5	110	110/400 = 0.275
201-300	200.5-300.5	90	90/400 = 0.225
301-400	300.5-400.5	100	100/400 = 0.25
401-500	400.5-500.5	30	30/400 = 0.075
501-600	500.5-600.5	70	70/400=0.175
Total	----	400	1

Now we draw the Histogram using the class boundary and relative frequency .