question_answer

What is the mean of the following frequency distribution?

X	5	7	8	9	12
Y	2	1	5	4	3

A)  \[\frac{\text{1}0\times \text{7}\times \text{4}0\times \text{36}\times \text{36}}{\text{2}+\text{1}+\text{5}+\text{4}+\text{3}}\]

B)   \[\frac{\text{5}+\text{7}+\text{8}+\text{9}+\text{12}}{\text{2}+\text{1}+\text{5}+\text{4}+\text{3}}\]

C) \[\frac{\left( \text{5}+\text{7}+\text{8}+\text{9}+\text{12} \right)-\left( \text{2}+\text{1}+\text{5}+\text{4}+\text{3} \right)}{\left( \text{5}+\text{7}+\text{8}+\text{9}+\text{12} \right)+\left( \text{2}+\text{1}+\text{5}+\text{4}+\text{3} \right)}\]

D)  \[\frac{\text{5}\times \text{2}+\text{7}\times \text{1}+\text{8}\times \text{5}+\text{9}\times \text{4}+\text{12}\times \text{3}}{\text{2}+\text{1}+\text{5}+\text{4}+\text{3}}\]