2. Recently. the City of Winnipeg has been criticized for its excessive discharges of untreated sewage into the Red River. A microbiologist takes 50 samples of water downstream from the treated sewage outlet and measures the number of coliform bacteria present. A summary table is as follows: Number of Bacteria Number of Samples 120 -29 15 30 -39 20 40 -149 15 50 -59 Compute for the following: 9. The mean bacteria per sample. (5 points) b. The sample median. (5 points) c./ The sample mode. (5 points) d. The lower quartile (Q1). (5 points) e. The 75 percentile (P,) (5 points) f. The sample variance. (s ) (5 points)