Question

Find the correct answer from the alternatives given.

The formula to find mean from a grouped frequency table is  \[X = A + \frac{\sum f_i u_i}{\sum f_i} \times hg\] .

Options

• \[\frac{x_i + A}{g}\] 

• \[\left( x_i - A \right)\] 

• \[\frac{x_i - A}{g}\]

• \[\frac{A - x_i}{g}\]

Answer 1

To find mean of a grouped frequency table using 

\[X = A + \frac{\sum f_i u_i}{\sum f_i} \times hg\]
In this formula, \[u_i = \frac{x_i - A}{g}\]