Q. 294.1( 15 Votes )
The following tab
We will find the mean marks using step - deviation method, where A = Assumed mean and h = length of class interval.
Here, let A = 17.5 and h = 5
Since, the class intervals are less - than type, we’ll first convert it into exclusive type.
We have got
A = 17.5, h = 5, Σfi = 80 & Σfiui = 17
∵ mean is given by
Thus, mean marks correct to 2 decimal places are 18.56.
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