Question

For a grouped data, if $X_i$, is the class mark and $f_i$ is the corresponding frequency, then by direct method, mean x is given by:

• A. $$\frac{\Sigma f_ix_i}{\Sigma f_i}$$
• B. $$\Sigma f_ix_i$$
• C. $$\frac{\Sigma x_i}{\Sigma f_i}$$
• D. $$\frac{\Sigma f_ix_i}{\Sigma x_i}$$

Answer 1

Answer:

$$\frac{\Sigma f_ix_i}{\Sigma f_i}$$

$\frac{\Sigma f_ix_i}{\Sigma f_i}$