If 1 sigma is equal to 68.26% and 6 sigma is equal to 99.9997%, what does 2 sigma equal?
A. 74.52%
B. 81.24%
C. 88.79%
D. 95.46%
Answer: D. 95.46%
2 sigma is 95.46% while 3 sigma is 99.73%.
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