$\"\"$

The data set containing the values $\"\"$ , $\"\"$ ....... $\"\"$ , the arithmetic mean $\"\"$ is defined by the formula

$\"\"$ .

$\"\"$

Find the value of $\"\"$ in terms of $\"\"$ and $\"\"$ .

Since set of $\"\"$ numbers has an average(arithmetic mean) is $\"\"$ , $\"\"$ .

Since set of $\"\"$ numbers has an a sum is $\"\"$ , $\"\"$ .

Substitute the values $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

The option A is the correct choice.

$\"\"$

The option A is the correct choice.