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At a high school, the ages of all employees during the last ten years are normally distributed. It has been calculated that 95.4% of the ages fall between 22.1 and 53.9 years. What is the standard deviation of the data?
A: 4.85 yr
B: 7.95 yr
C: 9.7 yr
D: 15.9 yr

Sagot :

Answer:

I'm sorry for trolling you, but ur mom

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