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2.4.88 Question Help 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 1.37 1.52 1.59 1.44 1 43 1 46 a. Find the range of the ammonia levels. Give the units of measurement for the range. The range is 0.22 ppm (Type an integer or a decimal) b. Find the variance of the ammonia levels. If possible, give the units of measurement for the variance The variance is |with (Round to four decimal places as needed.)