How can we tàke ' a' and 'h' in step deviation method for the class interval like
20-60
60-100
100-150
150-250
250-350
350-450

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Solution

Dear student
$h = Upper limit - lower limit A = middle value from the column x_{i}$
and such type of frequency distribution is not a part of your syllabus.
Regards

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No. of Wickets	$20 - 60$	$60 - 100$	$100 - 150$	$150 - 250$	$250 - 350$	$350 - 450$
No. of Bowlers	$7$	$5$	$16$	$12$	$2$	$3$

\frac{\sum f_{i} u_{i}}{\sum f_{i}}

\begin{matrix} Class interval & Frequency (f_{i}) & Class mark (x_{i}) & d_{i} = x_{i} - a & u_{i} = \frac{d_{i}}{h} 0 - 100 & 40 & 50 & - 200 & - 2 100 - 200 & 39 & 150 & - 100 & - 1 200 - 300 & 34 & 250 & 0 & 0 300 - 400 & 30 & 350 & 100 & 1 400 - 500 & 45 & 450 & 200 & 2 \end{matrix}

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40

Marks	$150 - 200$	$200 - 250$	$250 - 300$	$300 - 350$	$350 - 400$	$400 - 450$	$450 - 500$
Students	$2$	$3$	$12$	$10$	$4$	$6$	$3$

\begin{matrix} C l a s s i n t e r v a l & F r e q u e n c y (f_{i}) & C l a s s m a r k (x_{i}) & d_{i} = x_{i} - a & u_{i} = \frac{d_{i}}{h} 0 - 100 & 40 & 50 & - 200 & - 2 100 - 200 & 39 & 150 & - 100 & - 1 200 - 300 & 34 & 250 & 0 & 0 300 - 400 & 30 & 350 & 100 & 1 400 - 500 & 45 & 450 & 200 & 2 \end{matrix}

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