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70%
To find the relative frequency, we take the number of times the event occurred (in this case, landing heads up) divided by the total number of trials.
Relative frequency = (Number of times event occurred / Total number of trials) * 100
Relative frequency = (560 / 800) * 100
Relative frequency = 0.7 * 100
Relative frequency = 70%
Therefore, the relative frequency of the coin landing heads up based on the results of this experiment is 70%.