Q4 of 43 Page 22

In the class intervals 10-20, 20-30, 20 is taken in

Since, 20 is included in the class interval 20-30.

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2

The difference between the highest and lowest values of the observations is called

 3

The difference between the upper and the lower class limits is called

 5

In a frequency distribution, the mid value of a class is 15 and the class interval is 4. The lower limit of the class is

 6

The mid-value of a class interval is 42. If the class size is 10, then the upper and lower limits of the class are: