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  1. Chapter 15 Class 11 Statistics
  2. Serial order wise
  3. Ex 15.2

Ex 15.2, 7

Last updated at Dec. 12, 2016 by

Ex 15.2, 7 - Find mean and variance for frequency distribution - Standard deviation and variance - Continuous frequency (grouped data)

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  1. Chapter 15 Class 11 Statistics
  2. Serial order wise
    3. Ex 15.2
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Transcript

Ex15.2, 7 Find the mean and variance for the following frequency distribution. โˆ‘โ–’ใ€–๐‘“๐‘–(๐‘ฅ๐‘– โˆ’๐‘ฅย ฬ… )^2 ใ€— = 68280 N = โˆ‘โ–’๐‘“๐‘– = 30 Variance ("ฯƒ" ^2) = 1/๐‘ โˆ‘โ–’ใ€–๐‘“๐‘–(๐‘ฅ๐‘– โˆ’๐‘ฅย ฬ… )^2 ใ€— = 1/30 ร—68280 = 2276

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