lacking exceptional quality or ability

falling within the middle range of a set of values or qualities that are being measured or evaluated

relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values)

relating to or constituting the most frequent value in a distribution

a statistic describing the location of a distribution

(sports) the ratio of successful performances to opportunities

achieve or reach on average

to find the sum of a set of numbers and then divide by the total number of values in the set