The mean of the following distribution is $49$ , find the missing frequency ' $a$ '
Class 0 - 20 20 - 40 40 - 60 60 - 80 80 - 100
Frequency 15 20 30 a 10

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Solution

Xi = ( difference in Class interval ) / 2

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Similar questions

62.8

50

F_{1}

F_{2}

Class	0 - 20	20 - 40	40 - 60	60 - 80	80 - 100	100 - 120	Total
Frequency	5	$F_{1}$	10	$F_{2}$	7	8	50

62.8

50

f_{1}

f_{2}

Class	0 - 20	20 - 40	40 - 60	60 - 80	80 - 100	100 - 120
Frequency	$5$	$f_{1}$	$10$	$f_{2}$	$7$	$8$

50.

120.

f_{1}, f_{2}

\begin{matrix} Class & 0 - 20 & 20 - 40 & 40 - 60 & 60 - 80 & 80 - 100 Frequency & 17 & f_{1} & 32 & f_{2} & 19 \end{matrix}

Find the missing frequencies in the following distribution , if the sum of the frequencies is $120$ and the mean is $50$ .

$\begin{matrix} Class & 0 - 20 & 20 - 40 & 40 - 60 & 60 - 80 & 80 - 100 Frequency & 17 & f_{1} & 32 & f_{2} & 19 \end{matrix}$

Marks	0 - 20	20 - 40	40 - 60	60 - 80	80 - 100
Frequency	5	10	20	10	15

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