Following is the distribution of the percentages of the students who are bilingual in 50 elementary schools: Percentage -- # of Schools 0-4 -- 18 5-9 -- 15 10-14-- 9 15-19 -- 7 20-24 -- 1 Find the mean and the median. Solution mean = sum of all items of data/ no of of items in data median = middle item in data in case no of item is odd, and middle two values in case of even data.