Talk:Level 836/@comment-3225604-20171026111911/@comment-3225604-20171028215224

From Wikipedia: "In statistics, the standard deviation (SD, also represented by the Greek letter sigma σ or the Latin letter s) is a measure that is used to quantify the amount of variation or dispersion of a set of data values."

For the values, the difficulty rating takes a number for conversion, i.e. very easy=1, easy=2 and so on. For example on this level there is one user voting for a very easy rating on this level, so there is one "1" data in the set of data, likewise we would have this: {1, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 7, 7, 7}. The equation of the standard deviation of the data is equal to the square root of the summation of the square of the difference between a data and the mean of the data. An extreme datum would be defined as a datum lying outside the region of the difference between mean and the standard deviation or the sum between mean and the standard deviation.

And well the difficulty rating of levels can only be edited by administrators themselves but we base the difficulty rating on everyone's opinions. In other words, YOU can also be the "judge" of this level.