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1. Standard Deviation
By-Dr. Ekta Khare

2. Standard Deviation
•StandarddeviationiscommonlyabbreviatedasSDand
denotedby'σ’andittellsaboutthevaluethathowmuchit
hasdeviatedfromthemeanvalue.
•Itisthemeasureofthedispersionofstatisticaldata.
•Ifwegetalowstandarddeviationthenitmeansthatthe
valuestendtobeclosetothemeanwhereasahighstandard
deviationtellsusthatthevaluesarefarfromthemeanvalue.
•Standarddeviationisthepositivesquarerootofthevariance.
•Varianceisdefinedas“Theaverageof
thesquareddifferencesfromtheMean. ”

4. ... Variance and Standard Deviation Formula

6. Standard
Deviation of
Grouped Discrete
Frequency
Distribution