Posted by mona on Monday, April 25, 2011 at 1:45pm.
CI99 = mean + or - 2.58(sd/√n)
...where + or - 2.58 represents the 99% confidence interval using a z-table, sd = standard deviation, √ = square root, and n = sample size.
Substitute what you know into the above formula and go from there.
I hope this will help get you started.
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