statistics
posted by susan .
use the given information to find the minimum sample size required to estimate an unknown population mean. Margin of error/; $137, confidence level:99%, standard deviation = $535

Formula:
n = [(zvalue * sd)/E]^2
...where n = sample size, zvalue will be 2.58 using a ztable to represent the 99% confidence interval, sd = 535, E = 137, ^2 means squared, and * means to multiply.
Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.