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Mean, Median, Mode of Grouped Data — Maths STD 10 — Question

CBSE BoardEnglish MediumSTD 10MathsMean, Median, Mode of Grouped Data2 Marks
Question
While calculating the mean of a given data by the assumed-mean method, the following values were obtained:
$\text{A}=25,\ \sum\text{f}_\text{i}\text{d}_\text{d}=110,\ \sum\text{f}_\text{i}=50.$
Find the mean.
✓

Answer

$\text{A}=25,\ \sum\text{f}_\text{i}=50$ and $\sum\text{f}_\text{i}\text{d}_\text{i}=110$
Mean $=\text{A}+\frac{\sum\text{f}_\text{i}\text{d}_\text{i}}{\sum\text{f}_\text{i}}$
$=25+\frac{110}{50}$
$=25+2.2$
$=27.2$

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