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Stastics — Maths STD 10 — Question

CBSE BoardEnglish MediumSTD 10MathsStastics1 Mark
MCQ
In formula $\overline{\text{x}}=\text{a+h}\frac{\sum\text{f}_i\text{u}_i}{\sum\text{f}_i}$ for finding the mean,$\text{u}_\text{i}=$
  • ✓
    $\frac{\text{x}_\text{i}\text-{a}}{\text{h}}$
  • B
    $\frac{\text{a}-\text{x}_\text{i}}{\text{h}}$
  • C
    $\text{h}(\text{x}_\text{i}-\text{a})$
  • D
    $\frac{\text{x}_\text{i}+\text{a}}{\text{h}}$
✓

Answer

Correct option: A.
$\frac{\text{x}_\text{i}\text-{a}}{\text{h}}$
In formula $\overline{\text{x}}=\text{a+h}\frac{\sum\text{f}_i\text{u}_i}{\sum\text{f}_i}$ for finding the mean,
$\text{u}_\text{i}=\frac{\text{x}_\text{i}-\text{a}}{\text{h}}.$
$a =$ assumed mean values
$\text{x}_\text{i}-\text{a}=$ deviation of each mid $-$ value from the assumed mean value
$h =$ class size

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