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# OCR MEI S1 Standard Deviation Watch

1. Hey,

Does the standard Deviation equation given in the formula book ? because I could not find it !

Thanx
2. (Original post by yoomi)
Hey,

Does the standard Deviation equation given in the formula book ? because I could not find it !

Thanx
You're right: it is not included, and thus you have to memorise it (or use your calculator's standard deviation function if it has one).
3. (Original post by HapaxOromenon2)
You're right: it is not included, and thus you have to memorise it (or use your calculator's standard deviation function if it has one).
Ok thank u so much
4. how do you use the standard deviation function on a calculator HapaxOromenon2 , i have the casio fx991es plus
5. (Original post by kevvvvvv)
how do you use the standard deviation function on a calculator HapaxOromenon2 , i have the casio fx991es plus
See
6. make sure you give sx if they ask for standard deviation or sample standard deviation. if they ask for root mean square deviation ( rmsd ) then give σx instead.

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