18.
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the average is 16 11+16+15+22=64 64/4=16
There are 8 numbers. So you need to find the average of the 4th and 5th numbers when they are placed in order. So, average of 16 and 19 = 17.5
In the example provided, the quartiles are: 25% = 16.5 (the median of {15, 16, 17, 18}) 50% = 18.5 (the median of {15, 16, 17, 18, 19, 20, 21, 22}) 75% = 20.5 (the median of (19, 20, 21, 22})
15 - 25 degrees.
22 + 16 = 38 22 - 16 = 6 as 38 / 2 = 19 6 / 2 = 3 16 + 3 = 19 = 22 - 3