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4. Mental Math and Estimation from page 104 of MathWorks11. (12 marks) Below are two graphs displaying the Vancouver Island marmot population. The blue section

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4. Mental Math and Estimation from page 104 of MathWorks11. (12 marks) Below are two graphs displaying the Vancouver Island marmot population. The blue section of the graph represents the percentage of the population that is composed of adult marmots and the green section represents the percentage of the population that is composed of juveniles. Vancouver Island Marmot Population, Adult and Juvenile Composition Juvenile Adult 1979 1998 a) In 1998, about what percentage of the Vancouver Island marmot population was composed of adults? b) Estimate by how much the percentage of adults decreased between 1979 and 1998

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