I believe that clamour means to demand noisily, or persistently, in an excited or angry way. Or, to shout at the same time as other people, causing a loud noise.
I don't believe that the sufix -ed, can be added to the word though.
The mean distance is the same as the mean of a set of numbers,but this time, instead of them just being numbers, they're lengths. You just simply add up all the numbers and divide the total length,...