What is the Mean of a data set?

The height of 5 students areĀ  5, 4, 6, 3 and 5 feet. What is the average (mean) height of the students?

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What is the arithmetic mean of the following data set :

4, 6, 9, 2, 1 , 4

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What is the arithmetic mean of the following data set:

3, 4, -1, 4, 10, 5, 7

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