The mean monthly return on (U.S. Treasury bills) T-bills is 0.42% with a standard deviation of 0.25%. What is the coefficient of variation? Statistical Concepts and Market Returns The mean monthly return on (U.S. Treasury bills) T-bills is 0.42% with a standard deviation of 0.25%. What is the coefficient of variation?A) 84%.B) 60%.C) 168%.Answer: B Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+