Question 178407
The volume of a sphere is
{{{V=(4/3)(pi)r^3}}}
So if the diameter is 2.5 inches, the radius is (2.5)/2 inches, which is 1.25 inches.  So the volume of the tennis ball is
{{{V=(4/3)(pi)1.25^3}}}
{{{V=(4/3)(pi)(1.953125)=8.2}}}
So volume is 8.2 in^3.