Question 1152625
SD of the sample = {{{SD/sqrt(n)}}} = {{{3.4/sqrt(91)}}} = 0.36
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Because we are looking at a 99% confidence interval, z* will be 2.576.
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The confidence interval will be: (z*)(0.36) = (2.576)(0.36) = 0.9
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Subtract/add 0.9 from/to the sample mean of 66.2.  We get 65.3 and 67.1.  
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<b>The 99% confidence interval is 65.3 to 67.1</b>.