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Mathematics 8 Online
OpenStudy (anonymous):

A sample of 12 measurements has a mean of 8.5 and a sample of 20 measurements has a mean of 7.5. Find the mean of all 32 measurements.

OpenStudy (anonymous):

((12x8.5) + (20x7.5)) /32 (102 + 150) /32 252/32 7.87

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