Answer :

The cumulative frequency of the given data can be calculated as:

As per the question,

N= 100

Hence,

Median class = 7-10

Lower limit, l = 7

cf = 36

f = 40

h = 3

Now,

Median can be calculated as:

h

= 8.05

Now, mode can be calculated as: class corresponding to maximum frequency.

Modal class = 7-10

l = 7

h = 3

f1 = 40

f0 = 30

f2 = 16

=

= 7.88

Now, mean of the following data can be calculated as:

= 8.25

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