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Q.

Arithmetic mean for grouped data can be calculated by


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a

    step deviation method

b

    all of the above 

c

    direct method

d

    assumed mean method

answer is D.

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Detailed Solution

We hav to find the method by which we can calculate arithmetic mean of grouped data.
The "arithmetic mean" is the average value within a given set of data. There are several methods for calculating the arithmetic mean, including the direct method, which involves adding up all the data and dividing by the total number of figures in the data to determine the mean class, the assumed mean method, and the step deviation method, which divides the data of the given class into smaller units to facilitate calculation and determine the mean of the class.
Hence, the correct option is 4.
 
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