18. In the equation for computing the standard deviation, n represents what? a. the average b. the mean c. the frequency d. the number of measurements 19. Cp for 99.7% probability is a. 3.00 b. 2.00 C. 1.00 d. 0.50 20. Define propagation of random errors. 21. T or F In determining the probable error of a distance measured multiple times, the sum of the squares of the residuals must be determined. 22. A distance is measured 10 times with each measurement having a 0.02 ft error. The total error is a. 0.02 ft b. 0.06 ft c. 1.41 ft d. 0.20 ft 23. T or F The more times a distance is measured, the estimated error in the mean will become smaller. 24. A triangular shape of land is measured. Side 1 had an error of 10.02 ft, side 2's error was +0.035 ft, and side 3's error was 40.018 ft. The total probable error is a. 0.73 ft b. 0.56 ft c. 0.12 ft