In a frequency distribution, the first and the second classes are 0-10 and 10-20 respectively. What is the lower limit of the fourth class if the class size is same?

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Solution

The correct option is D 30
In the given classes, the class size
= upper limit $-$ lower limit
= 10 $-$ 0 = 10

Hence the first four classes are,

1st class interval 0-10

2nd class interval 10-20

3rd class interval 20-30

4th class interval 30-40

The fourth class is 30-40. Hence, the lower limit of the fourth class is 30.

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In a frequency distribution with classes 0-10, 10-20 etc., the size of the class intervals is 10. The lower limit of fourth class is:

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1st class interval	0-10
2nd class interval	10-20
3rd class interval	20-30
4th class interval	30-40