The article modeling sediment and water column interactions for hydrophobic pollutants suggests the uniform distribution on the interval (7.5,20) as a model for depth (cm) of the bioturbation layer in sediment in a certain region stats. what is the mean and variance of depth? what is the cdf of depth? what is the probability that observed depth is at most 10? between 10 and 15? what is the probability that the observed depth is within one standard deviation of the mean value? within 2 standard deviations?