Cho X là đại lượng ngẫu nhiên có hàm mật độ dạng
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Remember, the volume formula of a sphere is 
.
Set that equation equal to whatever volume they give you and solve for r.
= 
Now solve for r! I know you can do this. If you need help, just comment.
Set that equation equal to whatever volume they give you and solve for r.
Now solve for r! I know you can do this. If you need help, just comment.
