Question

The cumulative frequency of the class 70 - 90 is:

विकल्प

• 80

• 120

• 180

• 40

Answer 1

120

Explanation:

From the graph, we form the cumulative frequency table:

Class	Frequency	Cumulative frequency
30-50	50	50
50-70	30	80 (50 + 30)
70-90	40	120 (80 + 40)
90-110	60	180 (120 + 60)