HHi, I am doing and open book assignment and I cannot figure out how to calculate variability and standard deviation. Can anyone help me solve this and explain the steps so I can better do this in the future?

The rates of return on Cherry Jalopies, Inc., stock over the last five years were 12 percent, 11 percent, -3 percent, 2 percent, and 6 percent. Over the same period, the returns on Straw Construction Company's stock were 16 percent, 17 percent, -6 percent, 4 percent, and 9 percent. Calculate the variances and the standard deviations for Cherry and Straw. (Do not round intermediate calculations. Enter your variance as a decimal rounded to 5 decimal places. Enter your standard deviation as a percent rounded to 2 decimal places.) Cherry Straw Variance Standard deviation % %