Question

Prepare a frequency series of the age of 25 students of class XI in your school:-
15, 16,16,17,18,18,17,15 ,15 ,16 ,16 ,17,15 ,16 ,16 ,15 ,16 ,16 ,15 ,17,17,18 ,19 ,16 ,15.​

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11th

Economics

Collection of Data

Collecting and Grouping Data

Prepare the frequency distr...

STATISTICS

Prepare the frequency distribution table for the given set of scores:

39,16,30,37,53,15,16,60,58,26,28,19,20,12,14,24, 59,21,57,38,25,36,24,15,25,41,52,45,60,63,18,26,43,36,18,27,59,63,46,25,33,46,42,48,35,64,24.Take class intervals as (10−20),(20−30),.... and answer the following:

(i) What does the frequency corresponding to the third class interval mean?

(ii) What is the size of each class interval? Find the midpoint of the class interval 30−40.

(iii) What is the range of the given set of scores?

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ANSWER

Class Interval

Frequency

10-20

20-30

30-40

40-50

50-60

60-70

10

12

7

7

8

3

(i) For Cumulative Frequency 30−40 frequency is 7

(ii) Size is 11

Mid point for cumulative frequency 30−40 is 35.

(iii) Range =70−10=60