Standard Deviation in R Seems to be Returning the Wrong Answer - Am I Doing Something Wrong

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An easy illustration of standard deviation calculation:

The result of d - c(2,4,4,4,5,5,7,9) sd(d) is

[1] 2.13809, however the result is 2, when calculated by hand. What do I not see here?
Jun 30, 2022 in Data Science by avinash
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