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Question: The velocity (m/sec) of water flow in a pipe of 25 m diameter for consecutive days of a month are observed as:
1.51.51.61.41.51.4
1.61.41.51.31.41.3
1.41.51.71.61.51.5
1.51.41.31.51.51.6
1.71.51.41.41.41.5

Find the class boundaries for the last class by constructing an ungrouped frequency distribution.


A ) 1.7
B ) 1.65 - 1.75
C ) 1.6 - 1.7
D ) 1.55 - 1.75

Steps to derive

1 Range of the data =1.7 - 1.3 = 0.4

2 Since the range of the data set is small, use discrete data for the classes.

3 The classes are 1.3, 1.4, 1.5, 1.6 and 1.7.

4 The class boundaries, tally marks and the frequency for each class (number of tally marks) are shown in the table.



6 The class boundaries for the last class is 1.65 - 1.75.



Hence the right answer is Option B

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