Calculating Number of Samples for Monte Carlo Simulation

I have been given the task of finding the number of samples needed for a Monte Carlo simulation for wind speed. I have been given only the coefficient of variance of the data. How do I do this?

Thank you.

[Image Analyst]

They probably shared the formula with you in your class or textbook. http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers

[Stanislaus Cristo]

Apparently not, and we don't use a textbook.