Statistics Q16 — Class 10 Maths Solution

Maths Statistics CBSE Board 2026 Medium

Let '

a

' be the assumed mean and '

h

' be the class size for a grouped data. Which of the following is not the correct formula to find the mean of the grouped data ?

(a) $\overset{x}{ˉ} = \frac{\sum f _{i} x _{i}}{\sum f _{i}}$
(b) $\overset{x}{ˉ} = a + \frac{\sum f _{i} d _{i}}{\sum f _{i}}$ , where $d_{i} = x_{i} - a$
(c) $\overset{x}{ˉ} = a + \frac{\sum f _{i} u _{i}}{\sum f _{i}}$ , where $u_{i} = \frac{x _{i} - a}{h}$
(d) $\overset{x}{ˉ} = a + \frac{\sum f _{i} y _{i}}{\sum f _{i}} \times h$ , where $y_{i} = \frac{x _{i} - a}{h}$

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