Let's sort the data
9.9, 10.2, 10.6, 10.6, 11.9
The median is clearly 10.6, the middle value. The sum is 53.2 so the mean is 53.2/5 = 106.4/10 = 10.64
mean - median = 10.64 - 10.6 = 0.04
Answer: 0.04
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