1
Question
Prepare a continuous series from the following data:
Prepare a continuous series from the following data:
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Solution
From the mid-values the class size is calculated using the following formula.
Class Size = Mid value of one class - Mid value of the preceding class
Class Size =135−125=10
Now, the upper and lower limit for each of the class intervals is calculated as follows.
Lower limit = Mid value − Class Size ÷2 or,
Lower limit = Mid value−102
Thus, Lower limit=Mid value−5
Upper limit = Mid value + Class Size÷2 or,
Upper limit = Mid value +102
Thus, Upper limit =Mid value+5
Mid Value Class Interval f 125
135
145
155
165 120−130
130−140
140−150
150−160
160−170 10
9
12
8
6
From the mid-values the class size is calculated using the following formula.
Class Size = Mid value of one class - Mid value of the preceding class
Class Size =135−125=10
Now, the upper and lower limit for each of the class intervals is calculated as follows.
Lower limit = Mid value − Class Size ÷2 or,
Lower limit = Mid value−102
Thus, Lower limit=Mid value−5
Upper limit = Mid value + Class Size÷2 or,
Upper limit = Mid value +102
Thus, Upper limit =Mid value+5
| Mid Value | Class Interval | f |
| 125 135 145 155 165 | 120−130 130−140 140−150 150−160 160−170 | 10 9 12 8 6 |
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