standard deviation
standardhälve
olemus
ISO/IEC Guide 98:
dispersiooni positiivne ruutjuur
= positive square root of the variance
piltlikult
http://www.statisticshowto.com/wp-content/uploads/2012/11/standard-deviation-examples1.png
https://duckduckgo.com/?q=standard+deviation&t=h_&iax=images&ia=images
ülevaateid
https://en.wikipedia.org/wiki/Standard_deviation
https://www.mathsisfun.com/data/standard-deviation.html
https://www.scribbr.com/statistics/standard-deviation/
https://ocw.mit.edu/courses/mathematics/18-05-introduction-to-probability-and-statistics-spring-2014/readings/MIT18_05S14_Reading6a.pdf