The number of the four groups in a class is as follows: 12, 12, x, 10. Given that the median of this group of data is equal to the average, what is x?

The first type (12 + 12 + 10 + x) / 4 = x
X = 11. Several
The second type (12 + 12 + 10 + x) / 4 = 10
X = 6, no conformity
The third type (12 + 12 + 10 + x) / 4 = 12
X = 14, the test is in accordance with the standard

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