Statistics
RD Sharma
CBSE
Grade 10
Question:
For a given distribution, $\sum f_i d_i = 50$, $\sum f_i = 100$ and assumed mean $a = 25$. Find the mean of the distribution.
Step-by-Step Solution
Key Concept: $\bar{x} = a + \dfrac{\sum f_i d_i}{\sum f_i} = 25 + \dfrac{50}{100} = 25 + 0.5 = 25.5$.
$\bar{x} = 25 + \dfrac{50}{100} = 25 + 0.5 = 25.5$. [2.0 Marks]
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🎯 Official CBSE Marking Scheme:
Applying assumed mean formula and evaluating $= 25.5$: 2.0 Marks
Correct Answer:
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