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Hp12c standard deviation

Hi

Im using a HP12c but I cant get the standard deviation, as per my lecturer's answer.

Can someone guide me how to input into HP12c, hopefully getting the same answer as my lecturer Question.
I did read the manual on standard deviation. but the answer is different.

Is there a way I can insert an image of the question?

 

Hi,

 

Could you send us your input and both outcomes please so we can look into it? Please use moravia@moravia-consulting.com. Thanks!