Question 1175528
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Hi
Normal distribution: σ = 62.4
to be 99.5% confident that the estimate is within 2.5 of the true population mean. 
How large of a sample size is required? invNorm(.995) = 2.5758
ME ={{{ z*sigma/sqrt(n)}}} 0r n = {{{(z*sigma /ME)^2}}}
 n = {{{((2.5758*62.4)/(2.5))^2}}} = 4134 (rounded up to whole number)

Wish You the Best in your Studies.
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