] The number of Btu's of petroleum and petroleum products used per person in a certain year was normally distributed with mean 153 Btu's and standard deviation 25 million Btu's. Approximately what...

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Extracted text: ] The number of Btu's of petroleum and petroleum products used per person in a certain year was normally distributed with mean 153 Btu's and standard deviation 25 million Btu's. Approximately what percentage of the population used between 128 1nd 178 million Btu's during that year? Approximately what percentage of the population used in excess of 228 million Btu's?