Finding the medianWhen finding the median of a set of data, first put the data in order and then find the number located right in the middle. For example, find the median for the following set: S_{1} = {15, 14, 11} Put the numbers in order 11, 14, 15 The median is 14 because it is in the middle Other examples: S_{2} = {5, 3, 7, 2, 4} Put the set in order 2, 3, 4, 5, 7 In the example above, the median is 4 because 4 is in the middle When the number of numbers in the set is an odd number as in the two sets above, your median is right in the middle. However, when the number of numbers in the set is an even number, you will end up with two numbers in the middle In this case, just take the average of the numbers Examples S_{3} = { 15, 14, 11,16} Put S_{3} in order 11, 14, 15, 16 The two values in the middle are 14 and 15 The average is (14+15)/2 = 29/2 = 14.5 So, the median is 14.5 S_{4} = { 6, 2, 8, 9, 1, 10, 4, 12} Put S_{4} in order Tips When a set contains many numbers, cross out numbers as you put them in order to keep yourself organized For example for S_{4}, put 1 in your new ordered list and then cross it out. Then, put 2 and cross it out... 1, 2, 4, 6, 8, 9, 10, 12 The two numbers in the middle are 6 and 8 (6 + 8)/2 is 7, so the median is 7 Fun math game: Destroy numbered balls by adding to 10





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