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Statistics
NCERT Exemplar
CBSE
Grade 10
Question:
In the formula $\bar{x} = a + \dfrac{\sum f_i d_i}{\sum f_i}$, for finding the mean of grouped data, $d_i$ are deviations from $a$ of: (a) Lower limits of the classes (b) Upper limits of the classes (c) Mid-points of the classes (d) Frequencies of the class marks
Step-by-Step Solution
Key Concept: $d_i = x_i - a$, where $x_i$ is the class mark (mid-point of class).
$d_i$ represents the deviation of class marks $x_i$ (mid-points) from assumed mean $a$. [1.0 Mark]
--- 🎯 Official CBSE Marking Scheme: Selecting Mid-points of the classes: 1.0 Mark
Correct Answer:Mid-points of the classes
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