The class marks of a distribution are $11$ , $14$ , $17$ , $20$ , $23$ , $26$ and $29$ . Find the width of the class .

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Solution

The correct option is C $3$
Here, width of the class is $3$ , true class limits are $9.5 - 12.5, 12.5 - 15.5, 15.5 - 18.5, 18.5 - 21.5, 21.5 - 24.5, 24.5 - 27.5, 27.5 - 30.5$

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Question 93

The marks obtained (out of 20) by 30 students of a class in a test are as follows :
14, 16, 15, 11, 15, 14, 13, 16, 8, 10, 7, 11, 18, 15, 14,
19, 20, 7, 10, 13, 12, 14, 15, 13, 16, 17, 14, 11, 10, 20.
Preparing a frequency distribution table for the above data using class intervals of equal width in which one class interval is 4-8 (excluding 8 and including 4).

Q. If the class marks of a frequency distribution are

20, 25, 30, 35, 40

and

45

, find the classes and their width.

(i) Find the class mark of the class 90-120.
(ii) In a frequency distribution, the mid-value of the class is 10 and width of the class is 6. Find the lower limit of the class.
(iii) The width of each of five continuous classes in a frequency distribution is 5 and lower class limit of the lowest class is 10. What is the upper class limit of the highest class?
(iv) The class marks of a frequency distribution are 15, 20, 25, .... Find the class corresponding to the class mark 20.
(v) In the class intervals 10-20, 20-30, find the class in which 20 is included.

Q. The marks of 24 candidates in the subject mathematics are given below:

45	48	15	23	30	35	40	11
29	0	3	12	48	49	18	30
15	30	11	42	23	2	3	44

The maximum marks are 50. Make a frequency distribution taking class intervals 0 – 10, 10-20…

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The class marks of a distribution are 11, 14, 17, 20, 23, 26 and 29. Find the width of the class .

The correct option is C 3Here, width of the class is 3, true class limits are 9.5−12.5,12.5−15.5,15.5−18.5,18.5−21.5,21.5−24.5,24.5−27.5,27.5−30.5

The class marks of a distribution are $11$ , $14$ , $17$ , $20$ , $23$ , $26$ and $29$ . Find the width of the class .

The correct option is C $3$
Here, width of the class is $3$ , true class limits are $9.5 - 12.5, 12.5 - 15.5, 15.5 - 18.5, 18.5 - 21.5, 21.5 - 24.5, 24.5 - 27.5, 27.5 - 30.5$