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Let x be a random variable representing movement (in feet per year) of such sand dunes (measured from the crest of the dune). Let us assume that x has a normal distribution with μ = 11 feet per year and σ = 2.9 feet per year. Under the influence of prevailing wind patterns, what is the probability of each of the following? a) an escape dune will move a total distance of more than 90 feet in 9 years b) an escape dune will move a total distance of less than 80 feet in 9 years c) an escape dune will move a total distance of between 80 and 90 feet in 9 years

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