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Question

Find the mean of the step deviations:
Class intervalFrequency(fi)Class mark(xi)di=xi−aui=dih0−1004050−200−2100−20039150−100−1200−3003425000300−400303501001400−500454502002


A

0

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B

1188

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C

250

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D

250.52

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Solution

The correct option is B

1188


Class intervalFrequency(fi)Class mark(xi)di=xiaui=dihfiui0100405020028010020039150100139200300342500003004003035010013040050045450200290Totalfi=188fiui=1
Mean of step deviations =fiuifi=1188


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