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Stastics — Maths STD 10 — Question

CBSE BoardEnglish MediumSTD 10MathsStastics1 Mark
MCQ
In the formula $\overline{\text{X}}=\text{a}+\frac{\sum\text{f}_\text{i}\text{d}_\text{i}}{\sum\text{f}_\text{i}}$ for finding the mean of grouped data di’s are deviations from a of :
  • A
    lower limits of classes.
  • B
    upper limits of classes.
  • ✓
    mid $-$ points of classes.
  • D
    frequency of the class marks .
✓

Answer

Correct option: C.
mid $-$ points of classes.
We know that, $\mathrm{d}_{\mathrm{i}}=\mathrm{x}_{\mathrm{i}}-\mathrm{a}$
i.e, $d_i$ 's are the deviation from a mid $-$ points of the classes.

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