# Estimating Population Percentages from Normal Distributions: The Empirical Rule & Examples

Instructions:

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question 1 of 3

### _____ of normally distributed data is always contained within 1 standard deviation of the mean.

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### 2. _____ of normally distributed data is always contained within 3 standard deviations of the mean.

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Review your understanding of how to estimate population percentages from normal distributions with this quiz and worksheet.

## Quiz & Worksheet Goals

The focus of these assessments is:

• Finding the estimated percentage of area between the mean and 1 standard deviation
• How many standard deviations Six Sigma seeks to keep errors within
• The area between Z-scores -3 and 3

## Skills Practiced

• Information recall - access the knowledge you've gained regarding the area between specific Z-scores
• Making connections - use understanding of the concept Z-scores
• Reading comprehension - ensure that you draw the most important information from the lesson on estimating population percentages