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Using the concept about the median of a data-set, it is found that the median mass is of 17 kg.
The median of a data-set is the value that separates the bottom 50% from the upper 50% of values.
In this problem, there are 7 values, which is an odd number, hence the median is the (7+1)/2 = 4th number in the ordered set, which is of 17 kg.
More can be learned about the median of a data-set at https://brainly.com/question/23923146
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