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Basic Question 3 of 12
If a teacher computes the mean for a set of test scores and then subtracts this mean from each score, the sum of the resulting set of different scores will equal ______.
B. the mean
C. n times the mean
A. zero
B. the mean
C. n times the mean
User Contributed Comments 5
| User | Comment |
|---|---|
| udhay | Can some one explain this please. |
| VikramJ | Not sure why this is the case either. But I just made up an example. Let's say your set is [1,2] with mean 1.5. Subtract 1.5 from each value and you have -0.5 and 0.5 which equal 0.. |
| 2014 | Sum of deviations from mean is zero. (4,5,6) 15/3 = 5 4-5= -1 5-5=0 6-6=1 +1-1= 0 |
| msk500 | Good explanation, 2014 |
| cosmos1994 | 1,2,3 mean is 2 new set -1,0,1 >> -1+0+1=0 |
You have a wonderful website and definitely should take some credit for your members' outstanding grades.
Colin Sampaleanu
Learning Outcome Statements
calculate and interpret different approaches to return measurement over time and describe their appropriate uses;
CFA® 2024 Level I Curriculum, Volume 1, Module 1.