Question

Find arithmetic mean for the table given below

• A. $11.4$
• B. $12.5$
• C. $13.7$
• D. $15.6$

Answer 1

The correct option is A $11.4$

Arithmetic mean using direct method formula is $\overline{x}=\frac{\sum f_i{x}_i}{\sum f_i}$
First form a tabular column:
Therefore, $\overline{x}=\frac{\sum f_i{x}_i}{\sum f_i}$
$=\frac{114}{10}$
$=11.4$