document.write( "Question 1175528: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately
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Algebra.Com's Answer #801164 by ewatrrr(24785)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Hi\r\n" );
document.write( "Normal distribution: σ = 62.4\r\n" );
document.write( "to be 99.5% confident that the estimate is within 2.5 of the true population mean. \r\n" );
document.write( "How large of a sample size is required? invNorm(.995) = 2.5758\r\n" );
document.write( "ME =\"+z%2Asigma%2Fsqrt%28n%29\" 0r n = \"%28z%2Asigma+%2FME%29%5E2\"\r\n" );
document.write( " n = \"%28%282.5758%2A62.4%29%2F%282.5%29%29%5E2\" = 4134 (rounded up to whole number)\r\n" );
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document.write( "Wish You the Best in your Studies.\r\n" );
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