To find the mean let us put the data in the table given below:
Now, to find the median let us put the data in the table given below:
The cumulative frequency just greater than 12.5 is 16 and the corresponding class is 150 – 200.
Thus, the median class is 150 – 200.
∴ l = 150, h = 50, N = 25, f = 6 and cf = 10.
Now,
Hence, Mean = 169, Median = 170.83 and Mode = 174.49.
