The water acidity in a pool is considered normal when the average pH reading of three daily meas...

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The water acidity in a pool is considered normal when the average pH reading of three daily measurements is between \( 7.2 \) and \( 7.8 \). If the first two \( \mathrm{pH} \) reading are \( 7.48 \) and \( 7.85 \), find the range of \( \mathrm{pH} \) value for the third reading that will result in the acidity level being normal.
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