please answer questions 13.14.15 not abc from problem

10. The data in the following table represent time study observations for a woodworking operation. 2. Based on the observations, determine the standard time for the operation, assuming an allow- ance of 15 percent of job time. b. How many observations would be needed to estimate the mean time for element 2 within 1 percent of its true value with a 95.5 percent confidence? c. How many observations would be needed to estimate the mean time for element 2 within .01 minute of its true value with a 95.5 percent confidence? OBSERVATIONS (minutes per cycle) Performance Rating Element 1 2 3 4 5 6 1.20 1.17 1.16 1.24 1.15 1.22 0.82 0.83 0.87 0.78 0.85 1.32 1 110% 2 115 3 105 "Unusual delay, disregard time. 0.58 0.53 0.52 0.59 0.60 0.54 QUESTION 13 Chapter 7. Problem 10 Assuming an allowance of 15 percent of job time, what is the standard time for element based on the observations O 0.68 1.09 1.51 None of above QUESTION 14 Chapter 7. Problem 10 Assuming an allowance of 15 percent of job time, what is the standard time for the whole operation based on the observations? Please keep 2 digits after the decimal point.) QUESTION 15 Chapter 7. Problem 10 How many observations would be needed to estimate the mean time for element 2 within 0.01 minute of its true value with a 95 percent confidence? (Use Z value on page 314 table.) 45 047 66 68