Find the mean of the following distribution.
Class Frequency
$0 - 20$ $5$
$20 - 40$ $8$
$40 - 60$ $10$
$60 - 80$ $12$
$80 - 100$ $7$
$100 - 120$ $8$

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Solution

Class frequency(f) Class mark(x) fx
0-20 5 10 50
20-40 8 30 240
40-60 10 50 500
60-80 12 70 840
80-100 7 90 630
100-12 8 110 880
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50 3140
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Then, mean $= \frac{3140}{50} = 62.8$

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Class	Frequency
$0 - 20$	$5$
$20 - 40$	$8$
$40 - 60$	$10$
$60 - 80$	$12$
$80 - 100$	$7$
$100 - 120$	$8$

Find the mean of the following distribution.ClassFrequency0−20520−40840−601060−801280−1007100−1208

Find the mean of the following distribution.
Class Frequency
$0 - 20$ $5$
$20 - 40$ $8$
$40 - 60$ $10$
$60 - 80$ $12$
$80 - 100$ $7$
$100 - 120$ $8$