From the normal curve of error, find the probability that a result is outside the limits of ±2σ from the mean. What is the probability that a result has a more negative deviation from the mean than -2σ?

Appl Of Ms Excel In Analytical Chemistry
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Chapter2: Basic Statistical Analysis With Excel
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7. From the normal curve of error, find the probability that a result is outside the limits of ±2σ from the mean. What is the probability that a result has a more negative deviation from the mean than -2σ?
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We need to find from the normal curve of error, find the probability that a result is outside the limits of ±2σ from the mean and What is the probability that a result has a more negative deviation from the mean than -2σ. 

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