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Mathematics 8 Online
OpenStudy (anonymous):

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OpenStudy (anonymous):

the key here is that its a normal distribution. since the standard deviation is 3, then 47 is one standard deviation away you want the total number of bags tested, and you are given that the 12 bags are all one standard deviation below the average: |dw:1397102581110:dw| so you want to find the percentage of the normal model that is shaded in, and then you can solve for the total number of bags tested

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