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First, let's calculate the total number of people in the age group 12-18 who had over 500 text messages:
5 + 8 + 3 + 2 = 18
Next, let's calculate the relative frequency of people age 12-18 who had over 500 text messages:
(18 / 100) * 100 = 18%
Therefore, the relative frequency of people age 12-18 who had over 500 text messages is 18%.