A magazine published a study on the ammonia levels near the exit ramp of a highway tunnel. The data in the table below represent daily ammonia concentrations (in parts per million) on eight randomly selected days during the afternoon drive time. Complete parts a through c. 1.54 1.51 1.36 1.52 1.63 1.43 1.42 1.47 CI 3. Find the range of the ammonia levels. Give the units of measurement for the range. The range is V (Type an integer ora decimal.) b. Find the variance of the ammonia levels. If possible. give the units of measurement for the variance. The variance is with V (Round to four ceCimal p aces as needed.) c. Find the standard deviation of the ammonia levels. Give the units of measurement for the standard deviation. The standard deviation is V (Round to three deCimal places as needed.)