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system
can you explain how to calculate mean median and mode?
user
mean: the mean is determined by taking the sum of all values and dividing by the number of values. 

median: the median is the middle value when the values are placed in order of size. if the number of values is odd, the median is the middle value; and if the number of values is even, the median is the average of the middle two values. 

mode: the mode is the most commonly occurring value in a data set. if no values repeat, there is no mode.
assistant