Cut 5 pieces of string having the following lengths in inches. 2. 9 9. 5 5. 7 4. 2 7. 6 A subject measures the first length four times by eye. His measurements are 3. 2. 93. 13. 0 Suppose his measurements have a bias of 0. 1 inches. What are the four random errors for his measurements? What is the variance?