Question

Q.25 Prepare a continuous grouped frequency distribution from the following table
Class intervals
31-35
36-40
41-45
46-50
51-55
Frequency
4
8
13
12
6
Also, find the size of class intervals.

Answer 1

Answer:

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Step-by-step explanation:

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Solution :-

The class intervals given are not continuous so, first we will make it continuous by subtracting 0.5 from the lower limit of each class interval and adding 0.5 to the the upper limit of each class interval. After that we have to find the class marks (mid values) of each interval, that is (lower limit + upper limit)/2. The points of the frequency polygon for each class interval is (class marks, frequency).

Class Interval                  Class Marks (Mid Values)         Frequency

24.5 - 29.5                                   27                                         5

29.5 - 34.5                                   32                                        15            

34.5 - 39.5                                   37                                        23

39.5 - 44.5                                   42                                        20

44.5 - 49.5                                   47                                        10

49.5 - 54.5                                   52                                         7

Answer 2

Answer:

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Step-by-step explanation:

the point of the frequency polygon for each class interval is

24.5-29.5 27

5

29.5-34.5 32

15

34.5-39.5 37

23

39.5-44.5 42

20

44.5-49.5. 47

10

49.5-54.5. 52

7

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