The formula for the volume of pyramid is,
[tex]V=\frac{Bh}{3}[/tex]Here, B is base area and height of pyramid.
The volume expression for group 4 is,
[tex]V=\frac{1}{3}\cdot(\frac{8\cdot4}{2})\cdot9[/tex]Here, expression,
[tex]\frac{8\cdot4}{2}[/tex]represents the base area and 9 represent the height of pyramid.
So height of the pyramid created by group 4 is 9.
Answer: 9