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Ex 15.2, 8 - Find mean, variance - Chapter 15 Class 11 Statistics - Standard deviation and variance - Continuous frequency (grouped data)

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  1. Chapter 15 Class 11 Statistics
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Ex 15.2, 8 Find the mean and variance for the following frequency distribution. โˆ‘โ–’ใ€–๐‘“๐‘–(๐‘ฅ๐‘– โˆ’๐‘ฅย ฬ… )^2 ใ€— = 6600 N = โˆ‘โ–’๐‘“๐‘– = 50 Variance ("ฯƒ" ^2) = 1/๐‘ โˆ‘โ–’ใ€–๐‘“๐‘–(๐‘ฅ๐‘– โˆ’๐‘ฅย ฬ… )^2 ใ€— = 1/50 ร—6600 = 132

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