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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 ?
Which of the following is not the correct formula to find the mean of the grouped data ?
- (a)$\bar{x} = \frac{\Sigma f_i x_i}{\Sigma f_i}$
- (b)$\bar{x} = a + \frac{\Sigma f_i d_i}{\Sigma f_i}$, where $d_i = x_i - a$
- (c)$\bar{x} = a + \frac{\Sigma f_i u_i}{\Sigma f_i}$, where $u_i = \frac{x_i - a}{h}$
- (d)$\bar{x} = a + \frac{\Sigma f_i y_i}{\Sigma f_i} \times h$, where $y_i = \frac{x_i - a}{h}$
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Ans. (C) $\bar{x} = a + \frac{\Sigma f_i u_i}{\Sigma f_i}$, where $u_i = \frac{x_i - a}{h}$