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This video is for the redesigned SAT which is for you if you are taking the SAT in March 2016 and beyond.
Mean Word Problem - SAT
At a primate reserve, the mean age of all male primates is 15 years, and the mean age of all female primates is 19 years. Which of the following must be true about the mean age m of the combined group of male and female primates at the primate reserve?
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