It is (-15 + 20)/2 = 5/2 = 2.5
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11 13 15 18 20 20 The median is the middle number when they are in numerical order, so the median is 16.5. It is 16.5 because there is an even number of integers so you find the middle of 15 and 18
15
17.5 It is 2.5 more than 15 and 2.5 less than 20 To find a halfway point (which is also the average), add the numbers together and divide by 2.
(10+20)/2 = 30/2 = 15
'15' Hence 3 x 5 = 15 or 15/3 = 5 or 15/5 = 3