Ex 15.2, 4 - Find mean and variance xi fi - Chapter 15 Class 11 - Standard deviation and variance - Discrete frequency (grouped data)


  1. Chapter 15 Class 11 Statistics
  2. Serial order wise
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Ex 15.2, 4 Find the mean and variance for the data Now, finding variance โˆ‘โ–’ใ€–๐‘“_๐‘– (๐‘ฅ๐‘–โˆ’๐‘ฅย ฬ… )2ใ€—= 1736 โˆ‘โ–’๐‘“๐‘–=40 Variance (ฯƒ2) = (โˆ‘โ–’ใ€–๐‘“_๐‘– (๐‘ฅ๐‘– โˆ’ ๐‘ฅย ฬ… )2ใ€—)/(โˆ‘โ–’๐‘“๐‘–) = 1736/40 = 43.4

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