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Median M =
= 46 + .5
= 46.5
Example-7: Calculate the median from the following data:
Mid value Frequency
115 6
125 25
135 48
145 72
155 116
165 60
175 38
185 22
195 3
Solution: The class size is clearly equal to the difference between 2 consecutive mid
values i.e. 10. Subtracting and adding 5, from and to each mid-value, we get the class
intervals.
Class Interval Frequency Cumulative frequency
110 - 120 6 6
120 - 130 25 31
130 - 140 48 79
140 - 150 72 151
150 - 160 116 267
160 - 170 60 327
170 - 180 38 365
180 - 190 22 387
190 - 200 3 390
Total N = 390
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