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Find the mean of each of the following frequency distributions:
Class interval: | 50-70 | 70-90 | 90-110 | 110-130 | 130-150 | 150-170 |
Frequency: | 18 | 12 | 13 | 27 | 8 | 22. |
To do:
We have to find the mean of the given frequency distribution.
Solution:
Let the assumed mean be $A=100$
We know that,
Mean $=A+\frac{\sum{f_id_i}}{\sum{f_i}}$
Therefore,
Mean $=100+\frac{1220}{100}$
$=100+\frac{122}{10}$
$=100+12.2$
$=112.2$
The mean of the given frequency distribution is $112.2$.
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