It is: 73
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74
To answer this question, first rearrange the data values in non-decreasing order, which results in 73 74 75 76 78 78 80. The median is defined as the value in the middle of such an array, in this instance 76.
83
The variance of 73 72 67 74 78 84 79 71 76 76 79 81 75 80 78 76 78 = 16.8456
The median is 78.