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19. Suppose the sediment density (g/cm) of a randomly selected specimen from a certain region is normally distributed with mean 2.65 and standard deviation.85 (suggested in Modeling Sediment and WaterColumn Interactions for Hydrophobic Pollutants,WaterRes., 1984: 1169â1174).a. If a random sample of 25 specimens is selected, what is the probability that the sample average sediment density is at most 3.00? Between 2.65 and 3.00?b. How large a sample size would be required to ensure that the rst probability in part (a) is at least .99?