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Question

Find the mean of the given data:
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
Let A =250
Class intervalFrequency(fi)Class mark(xi)di=xiAui=dihfiui0100405020028010020039150100139200300342500003004003035010013040050045450200290Totalfi=188fiui=1
Mean =A+fiuifi×h=200+(1188 ×100)
Mean = 250.53

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