Answer:
to find the mean you must add all of the numbers in a data set together and then divide by how many numbers there are.
Step-by-step explanation:
when f=9, g=-3, then
<em>3√3</em>
<em>√27 =</em>
<em>= √3×9</em>
<em>= √3×3²</em>
<em>= 3√3</em>