find the level of confidence assigned to an interval estimate of the mean formed using the following intervals 2.17

find the level of confidence assigned to an interval estimate of the mean formed using the following intervals 

x ? 1.28 · ?x to x + 1.28 · 

x ? 2.17 · ?x to x + 2.17 · 

x ? 2.58 · ?x to x + 2.58 · 

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