6.10n Green Sea Urchins. From the paper “Effects of Chronic Nitrate Exposure on Gonad Growth in Green Sea Urchin Strongylocentrotus droebachienses” (Aquaculture, Vol. 242, No. 1-4, pp. 357-363) by s. Siikavuopio et al., we found that weights of adult green sea urchins are normally distributed with mean 52.0 g and standard deviation 17.2 g. (15 marks: 4 Marks For a., 3 Marks for b., 4 Marks Each For e. and d.) a. Find the percentage of adult green sea urchins with weights between 50 g and 60 g. b. Obtain the percentage of adult green sea urchins with weights above 40 g. c. Determine and interpret the 90th percentile for the weights. d. Find and interpret the 6th decile for the weights.