Arithmetic mean of grouped data and special property. Maths TNSB Mentoring, Class 9: lessons, tests, tasks.

1.	Arithmetic mean - Raw data
2.	A special property of arithmetic mean

1.	TBQ - Find the discarded number Difficulty: easy	1
2.	TBQ - Determine the mean Difficulty: easy	2
3.	TBQ - Find the mean Difficulty: easy	2
4.	Determine the height Difficulty: medium	2
5.	Find the sum of deviations Difficulty: medium	2
6.	Calculate the mean if each value is decreased Difficulty: medium	2
7.	Determine the correct average Difficulty: medium	2
8.	Find the new arithmetic mean Difficulty: hard	5

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Methodical recommendation

Arithmetic mean of grouped data and special property