In the formula \( \bar{X}=a+\frac{\sum f_{i} d_{i}}{\sum f_{i}} \), for finding the mean of grou... VIDEO
In the formula \( \bar{X}=a+\frac{\sum f_{i} d_{i}}{\sum f_{i}} \), for finding the mean of grouped data \( d_{i} \) s are deviations from the:
a Mean value of data
b Upper limits of the classes
c. Midpoints of the classes
d. Frequencies of the class marks.
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