Question 1199130
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Go to web-site 


https://www.calculator.net/standard-deviation-calculator.html?numberinputs=0.05+0.2+0.15+0.6&ctype=p&x=41&y=20


and use free of charge online calculator there.



In parallel, learn the theory/formula from this web-page.


The answer is  0.209165, and you can round it as you want.



If you need instructions on how to do it using TI-83 or TI-84, see and learn from these websites


https://www.youtube.com/watch?v=DdQHwgAVePk    
(youtube video-lesson)


https://www.mathbootcamps.com/how-to-find-the-standard-deviation-and-variance-with-a-graphing-calculator-ti83-or-ti84/    
(textual description)