Q. 114.7( 3 Votes )

If the mean of th

Answer :

Let the draw the frequency distribution table for the above data

As we know the mean(

In this case,

So we have

31.2 + 2.6y = 28 + 3y

3.2 = 0.4y

y = 8

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A data has 25 obsRS Aggarwal - Mathematics