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Question

Find the Arithmetic mean of the following data by Assumed mean method.
453113.png

A
21
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B
22
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C
30
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D
33
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Solution

The correct option is C 33
The above table represents the given data.
Let us take the assumed mean, a=25
We know that, by assumed mean method, the mean of the distribution is given by:

¯x=a+fidifi

¯x=25+[52065]=25+8

¯x=33

Hence, the mean of the given distribution, by assumed mean method, is 33.

812638_453113_ans_82a7b03d8eff4ab58a07826cfacbae92.png

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