Given that the football player catches the ball 70% of the time the ball is thrown to him, the set of numbers that could be used to represent when he catches the ball thrown to him is a set of number representing 70%.
For example, from the option: 30 - 99, 0 - 69 and 1 - 70 all represent 70 out of 100.
Thus, the set of numbers that could be used to represent when he doesn't catch the ball thrown to him is a set of number representing 100% -70% = 30%.
Therefore, the set of numbers that could be used to represent when he doesn't catch the ball thrown to him is 70 - 99 which represent 30 numbers.
