Mathematics, 07.09.2019 23:10 T0othless3clipes

In high school a the mean score of 50 students on a science test is 75. at high school b the mean score of 40 students on the same test is 80. what is the mean score of the 90 students

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In high school a the mean score of 50 students on a science test is 75. at high school b the mean sc...