Question: After analyzing data for a long period of time, it was determined that the readings of an organic pollutant for an area are distributed normally

After analyzing data for a long period of time, it was determined that the readings of an organic pollutant for an area are distributed normally with μ = 2.20 μg/m³ and σ = 0.50 μg/m³.

What percentage of the readings are between 2.50 μg/m³ and 3.50 μg/m³?

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