answer all questions with explanation

6. Crude oil biodegradation. Refer to the Journal of Petroleum Geology (April. 2010) study of the environmental factors associated with biodegradation in crude oil reservoirs. Exercise 2.18 (p. 37). Recall that amount of dioxide (mil- ligrams/liter) and presence/absence of crude oil was deter- mined for each of 16 water specimens collected from a mine reservoir. The data are repeated in the accompanying table. a. Find the mean dioxide level of the 16 water specimens. Interpret this value. b. Find the median dioxide level of the 16 water speci- mens. Interpret this value. C. Find the mode of the 16 dioxide levels. Interpret this value. d. Find the median dioxide level of the 10 water speci- mens with no crude oil present. e. Find the median dioxide level of the 6 water specimens with crude oil present. BIODEG Dioxide Amount Crude Oil Present 3.3 No 0.5 Yes 1.3 Yes 0.4 Yes 0.1 No No No Yes No No No Yes Yes 4.0 No 4.0 No 4.0 No Source: Permanyer. A.. et al. "Crude oil biodegradation and environmental factors at the Riutort oil shale mine, SE Pyrenees". Journal of Petroleum Geology, Vol. 33. No. 2, April 2010 (Table 1)