At least 15% of the players in the shipment will have no defects
B. 10 and 11
This is because 10x10 is 100, so thats less than what you need and then 11x11 is 121, and that is more than you need... So it would be between 10 and 11.
Your answer is A. You literally plug in the numbers for a and b to solve for the equation.