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To find the median number of hours spent on screens, we first need to arrange the numbers in ascending order:
0, 7, 8, 8, 10, 11, 14, 15, 17, 17.5, 18, 18, 18, 20, 30
Since we have 15 numbers, the median will be the average of the 8th and 9th numbers in this ordered list.
Median = (15 + 17)/2 = 16
Therefore, the median number of hours spent on screens by the kids surveyed is 16 hours.