For one of my questions "Suppose we have ball with radius 6. Suppose you cut the ball in half. What is the volume of the half ball? Use 3.14 for pi and round your answer to the nearest tenth if necessary. The grader said I was wrong with the answer of 452.2, but then provided me with this solution:

6^3 is 216 

216(4/3) = 288

and 288/2 = 144

so the answer should be 144(3.14) = 452.16 rounded up to 452.2 right?