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1. What type of variation is represented with a normal curve?
Skewed variation
Random variation
None, it is the desired process output
Don’t know
2. Which set of characteristics describes a normal curve?
Infinity at the center and zero at the edges
Constant slope with positive intercepts
Symmetric with a peaked center
Don’t know
3. In a standard normal distribution, what percentage of the data values will be between plus three sigma and minus three sigma?
99.73%
95.45%
121.21%
Don’t know
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