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Question 1 - Co-efficient of variation - Chapter 13 Class 11 Statistics
Last updated at August 17, 2026 by Teachoo
Chapter 13 Class 11 Statistics
Concept wise
- Mean deviation about mean - Ungrouped
- Mean deviation about mean - Discrete Frequency
- Mean deviation about mean - Continuous frequency distibution
- Mean deviation about median - Ungrouped
- Mean deviation about median - Discrete Frequency
- Mean deviation about median - Continuous frequency distibution
- Standard deviation and variance - Ungrouped data
- Standard deviation and variance - Discrete frequency (grouped data)
- Standard deviation and variance - Continuous frequency (grouped data)
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Co-efficient of variation
- Indirect questions - Multiplication of observation
- Indirect questions - finding remaining observations
- Indirect questions - Incorrect observation
Transcript
Question 1 The mean and standard deviation of marks obtained by 50 students of a class in three subjects, Mathematics, Physics and Chemistry are given below: Which of the three subjects shows the highest variability in marks and which shows the lowest? To compare the variation, we have to calculate coefficient of variation Coefficient of variation(C.V.) = ๐บ๐๐๐๐ ๐๐๐ ๐ซ๐๐๐๐๐๐๐๐๏ทฎ๐ด๐๐๐๏ทฏ ร 100 For Chemistry Mean = 40.9 Standard deviation = 20 CV = ๐๐ก๐๐๐๐๐๐ ๐๐๐ฃ๐๐๐ก๐๐๐๏ทฎ๐๐๐๐๏ทฏ ร 100 = 20๏ทฎ40.9๏ทฏ ร 100 = 48.89 So, CVmaths = 28.57, CVphysics = 46.87, Cvchemistry = 48.89 Since chemistry has highest CV, it has highest variability & Mathematics has lowest CV, so it has lowest variability.
