Relation between mean of Step- Deviations (u) and mean
Find the mean...
Question
Find the mean of the given data: ClassintervalFrequency(fi)Classmark(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 B1188 Let A =250 ClassintervalFrequency(fi)Classmark(xi)di=xi−Aui=dihfiui0−1004050−200−2−80100−20039150−100−1−39200−30034250000300−40030350100130400−50045450200290Total∑fi=188∑fiui=1 Mean =A+∑fiui∑fi×h=200+(1188×100) Mean = 250.53