Can someone help me: Find q

What is the size of the matrix resulting from

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?