A set of scores ranges from a high of X=24 to a low of X=12 and has a mean of 18. Which of the following is the most likely value for the standard deviation for the scores? ( Know the answer already, I juste need a good explanation on how the answer is found).
Step 1: Find the mean. Step 2: Subtract the mean from each score. Step 3: Square each deviation. Step 4: Add the squared deviations. Step 5: Divide the sum by the number of scores. Step 6: Take the square root of the result from Step 5.
