Find the mean of the following using step deviation method.

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Solution

The correct option is D
69

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Q. Find out median of the following series, using graphic technique:

Class Interval	40−45	45−50	50−55	55−60	60−65	65−70	70−75	75−80	80−85
Frequency	4	6	8	10	7	6	5	3	1

Q. i) Using step-deviation method, calculate the mean marks of the following distribution.
ii) State the modal class.

\begin{matrix} C l a s s i n t e r v a l & F r e q u e n c y 50 - 55 & 5 55 - 60 & 20 60 - 65 & 10 65 - 70 & 10 70 - 75 & 9 75 - 80 & 6 80 - 85 & 12 85 - 90 & 8 \end{matrix}

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Q. The following table gives the weights of one hundred persons. Copute the coefficient of dispersion by the method of limits.

Class-interval	40−45	45−50	50−55	55−60	60−65	65−70	70−75	75−80	80−85	85−90
No. of persons	4	13	8	14	9	16	17	9	8	2

Find the cumulative frequency for the class interval 65-70 $\begin{matrix} Class interval & Frequency 50 - 55 & 5 55 - 60 & 20 60 - 65 & 10 65 - 70 & 10 70 - 75 & 9 75 - 80 & 6 80 - 85 & 6 85 - 90 & 8 \end{matrix}$

Find the mean of the following data, using step-deviation method.

Class	5−15	15−25	25−35	35−45	45−55	55−65	65−75
Frequency	6	10	16	15	24	8	7

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Find the mean of the following using step deviation method.

The correct option is D 69

The correct option is D
69