The above answers gave the average of each of the set of numbers.
To calculate the average of a set of numbers, It is done by simply summing the numbers and then dividing the numbers by the total number of values in that set of numbers.
From the data given, zero, two, four and six all have their set of numbers. So, with those values, the average was calculated.
B. It keeps the bones from rubbing together. If the cartilage wasn't there, the bones might try to fuse. With some people, the absence of the cartilage would result in arthritis.
