Example 9 - Find variance and standard deviation - Class 11 - Standard deviation and variance - Discrete frequency (grouped data)

Slide21.PNG

  1. Chapter 15 Class 11 Statistics
  2. Serial order wise
Ask Download

Transcript

Example 9 Find the variance and standard deviation for the following data: First we will calculate mean Now, finding variance ﷮﷮ 𝑓﷮𝑖﷯ 𝑥𝑖− 𝑥﷯﷯2﷯= 1374 ﷮﷮𝑓𝑖﷯=30 Variance (σ2) = ﷮﷮ 𝑓﷮𝑖﷯ 𝑥𝑖 − 𝑥﷯﷯2﷯﷮ ﷮﷮𝑓𝑖﷯﷯ = 1374﷮30﷯ = 45.8 Standard deviation (σ) = ﷮45.8﷯ = 6.76

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 7 years. He provides courses for Mathematics and Science from Class 6 to 12. You can learn personally from here https://www.teachoo.com/premium/maths-and-science-classes/.
Jail