Question 4 of 16 - / 6.2 View Policies Current Attempt in Progress The life in hours of a 75-watt light bulb is known to be normally distributed with o = 25 hours. A random sample of 22 bulbs has a mean life of X = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. Round your answers to the nearest integer (e.g. 9876). i SAS (b) Construct a 95% lower-confidence bound on the mean life. Compare the lower bound of this confidence interval with the one in part (a). Round your answer to the nearest integer (e.g. 9876)