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Please answer the following question: The 18 students in Ms. Lu's period 1 class had a mean final mark of 72.0%. The 22 students in

Please answer the following question:

The 18 students in Ms. Lu's period 1 class had a mean final mark of 72.0%. The 22 students in his period 2 class had a mean final mark of 66.0%. Find the combined mean final mark of the two classes to one decimal place. (1 mark)

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