Total customers= 71+139+9 = 219
Probability that the next person will purchase no costume = 71/219=0.3242009132
The radius is <span>24.5
R = C/2pi
</span>
I'm going to assume you mean enclosed by the circle. If this is wrong, either use a comment to correct me or tell me what encloses the circle.
Area = pi*r^2
Area = 3.14 * 6^2 feet squared.
Area = 3.14 * 36
Area = 113.09 ft^2 or 113.1 ft^2