Mathematics
Mathematics, 23.04.2020 22:37, rekeiyip3

In the end of year history exam, the mean mark scored by the 30 students in form 11a was 55% and the mean mark scored by the 25 students in form 11b was 44%. What was the mean mark of all the students.

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In the end of year history exam, the mean mark scored by the 30 students in form 11a was 55% and the...

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