Week Three: Practice Exercises: Calculate Means, Std Deviation & Probability 1. Using the following five data values for these two variables X and Y, calculate the mean, median, mode, and standard deviation by hand. 2. Confirm that using the embedded Excel functions Average and Stdev. 3. Which of these two variables, X and Y, is more spread out? 4. What is the Z value that corresponds to 95% of each of these variables being to the left of it and 5% to the right? # X Y 1 1 11 2 10 2 3 9 9 4 7 21 5 7 14 6 5 124 7 4 17 8 7 33 9 10 29 10 6 20