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The shoe sizes of a group of middle school girls are shown. 5.5 6 7 8.5 6.5 6.5 8 7.5 8 5 If a shoe size of 4 is added to the data, how does the median change? The median stays 6.5. The median decreases to 6.5. The median stays 6.75. The median decreases to 6.75.