Example – Ungrouped data Question: The number of appointments at a doctors surgery for each of 18 days were: 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 11, 11, 12, 12, 13, 15, 16 Find the median, and first and ninth deciles of the number of appointments The median is the middle value: n/2 = 18/2 = 9 9.5 th value = = 10.5 appointments Whole number- so round up to.5 th 6 7 7 8 8 9 9 10 10 11 11 11 11 12 12 13 15 16 Answer: median Find average of 9 th and 10 th value
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