The sum of deviations of observations from their mean is always:
AZero
BFour
CFive
DNine
Answer & Solution
Correct answer: A. Zero
1. Some deviations from the mean are positive, some negative.
2. They balance exactly.
3. So their sum is zero.
_Source: NCERT Class 11 Mathematics, Chapter 15, Statistics._
Related questions
Standard deviation is a measure of:A larger range means the scores are more:In the batting example, batsman A had a range of:The coefficient of variation is useful for comparing series measured in:A measure of variability independent of units is the coefficient of:Mean deviation and standard deviation have the same units as the:The measure introduced to overcome the drawbacks of mean deviation is:Using absolute values means mean deviation cannot be given further: