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Question

For the given distinct values x1,x2,x3,.....xn occurring with frequencies f1,f2,f3,...fn respectively. The mean deviation about mean where ¯¯¯x is the mean and N is total number of observations would be


A

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B

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C

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D

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Solution

The correct option is B

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Clearly mean of the given distribution will be ¯¯¯x = ni=1 fi xini=1 fi

To find the mean deviation about ¯¯¯x we need sum of absolute deviation about ¯¯¯x for each xi

Which would be ni=1 fi | xi - ¯¯¯x|

Total number of observations = ni=1 fi = N

Mean deviation about mean = 1Nni=1 fi | xi - ¯x|

option b


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