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In a normally distributed data set a mean of 31 where 95% of the data fall between 27.4 and 34.6, what would be the standard

In a normally distributed data set a mean of 31 where 95% of the data fall between 27.4 and 34.6, what would be the standard deviation of that data set?

1.8

3.1

7.6

2.6

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