Question

find the
mean of the following
frequency distribution.
Xi=10
30 50 70 89
Fi=
7 8 10 15 10​

Answer 1

Answer:

Given;

x y xy

10 7 70

30 8 240

50 10 500

70 15 1050

89 10 890

Now as we know the mean is given by

\overline{x} = \dfrac{\sum f_ix_i}{\sum f_i}

x

=

∑f

i

∑f

i

x

i

Therefore we have

\overline {x} = \dfrac{70+240+500+1050+890}{7+8+10+15+10} =\dfrac{2750}{50} =55

x

=

7+8+10+15+10

70+240+500+1050+890

=

50

2750

=55

Hence the mean is 55

#Learn more

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