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प्रश्न
If xi's are the midpoints of the class intervals of a grouped data, fi's are the corresponding frequencies and `barx` is the mean then `sumf_i(x_i - barx) = ?`
पर्याय
1
0
–1
2
MCQ
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उत्तर
0
Explanation:
By definition `barx = (Σf_ix_i)/N`.
So `Σ f_i(x_i - barx) = Σf_ix_i - Σf_ibarx`
= `Nbarx − Nbarx`
= 0
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