1. If \(u_i = \cfrac{x_i − 35}{10}\), \(Σf_i u_i = 30\), and \(Σf_i = 60\), then find the value of \(\bar{x}\).

2. If \(u_i=\cfrac{x_i−35}{10} , Σf_iu_i=30\), and \(Σf_i=60\), then determine the value of \(\bar{x}\).

3. If \(u_i=\cfrac{x_i-35}{10}\), \(∑f_i u_i=30\), and \(∑f_i=60\), then determine the value of \(\bar{x}\).

4. If \(u_i=\cfrac{x_i−35}{10} , Σf_iu_i=30\) and \(Σf_i=30\), find the value of \(\bar{x}\).

5. If \(u_i = \cfrac{x_i - 35}{10}\), \(∑f_i u_i = 30\), and \(∑f_i = 60\), then the value of \(\bar{x}\) is –

(a) 40 (b) 20 (c) 80 (d) None of these

6. If \(u_i =\cfrac{x_i - 25}{10}\), \(\sum f_i u_i = 20\), and \(\sum f_i = 100\), then find the value of \(\bar{x}\).

7. If \(u_i = \frac{x_i - 30}{10}\), \(∑f_i = 50\), and \(∑u_i f_i = 25\), then what is the value of \(\bar{x}\)?