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The relative frequency of the chip landing with the yellow side facing up can be calculated by dividing the number of times it landed yellow side up by the total number of flips and then multiplying by 100.
Relative frequency = (number of yellow side up flips / total number of flips) x 100
Relative frequency = (28 / 50) x 100
Relative frequency = 0.56 x 100
Relative frequency = 56%
Therefore, the relative frequency of the chip landing with the yellow side facing up is 56%.
So the answer is: 56%