Find the standard deviation for the group of data items: Round answer to two decimal places.

To find the standard deviation, start by calculating the mean of your data set. Then, subtract the mean from each data point and square the result. Next, find the average of those squared differences. Finally, take the square root of that average to get the standard deviation. Remember, if you're working with a sample rather than a population, divide by the number of data points minus one in your final calculation. Don’t forget to double-check your calculations! Common mistakes happen when people forget to square the differences or mix up dividing by 'n' versus 'n-1'. Keeping a clean and organized data sheet can help prevent these errors and ensure accurate results. Happy calculating!