For the following distribution, calculate the range of data
Marks 20-30 30-40 40-50 50-60 60-70 70-80 80-90
No. of students 4 6 10 25 7 5 2

30

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40

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70

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80

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Solution

The correct option is B $70$
For the distribution, range is the difference between upper limit of the last interval and the lower limit of the first interval.

From the given table, The upper limit of the last interval is $90$ and
the lower limit of the first interval is $20$

Therefore, range is $90 - 20 = 70$

Suggest Corrections

Class – interval:	20 – 30	30 – 40	40 – 50	50 – 60	60 – 70	70 – 80	80 – 90
Frequency:	10	8	12	24	6	25	15

Marks	20-30	30-40	40-50	50-60	60-70	70-80	80-90
No. of students	4	6	10	25	7	5	2

Height(in cm)	30-40	40-50	50-60	60-70	70-80	80-90
No. of plants	4	3	8	11	6	2

Class	10-20	20-30	30-40	40-50	50-60	60-70	70-80	80-90
Frequency	9	11	15	24	19	9	8	5

Marks	0-10	10-20	20-30	30-40	40-50	50-60	60-70	70-80	80-90	90-100
Number of students	5	4	6	8	5	7	4	9	5	7