Mean is given by
⇒ Mean = 11.19
Total observation, N = 139
Since, N is odd (that is, 139 is odd),
Cumulative frequency = 79 is just greater than 70.
And cumulative frequency, 79 falls in no. of century, 10.
⇒ Median = 10
Mode is the value having highest frequency in the data.
From the table given above, 56 is the greatest frequency in the given frequencies.
Thus, the corresponding value in ‘number of centuries’, 5 is the mode.
⇒ Mode = 5
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