The mean, because the data distribution is symmetrical.
Step-by-step explanation:
Without even knowing the mean or median this can be solved. The data isn't skewed to the left nor right, so it is symmetrical. The mean is the central value of numbers so it should represent the center well.
The surface area of a sphere is where r is the radius; The circumference is so that using this value we can evaluate the surface area of 1 ball as: For 100 ball you get: