Q. 35.0( 3 Votes )

# Marks obtained by

Answer :

We have grouped frequency distribution and we need to find mean by assumed-mean method.

Assumed-mean method is given such name because in this method, we actually assume a mean from xI (usually a centre value) and the formula of mean is also based on that particular assumed mean.

By using assumed-mean method, we can avoid the risk of miscalculation. Also, by using assumed mean method, we’ll be able to solve the question with ease and more accuracy.

So, let us assume mean from the midpoints. Let assumed mean, A = 25 (a value quite centrally placed). So now, we have

fidi = 120 and fi = 140.

And we have assumed mean as, A = 25

Mean is given by  Mean = 25 + 0.86

Mean = 25.86

Thus, mean is 25.86.

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