2-25.125=-23.125 = 534.77
5-25.125=-20.125 = 405.02
47-25.125=21.875 = 478.52
11-25.125=-14.125 = 199.52
13-25.125=-12.125 = 147.02
48-25.125=22.875 = 523.27
39-25.125=13.875 = 192.52
36-25.125=10.875 = 118.27
If I divide by one less,which I am supposed to do I think, I get 371.20 sqrt= 19.27
If I divide by 8 I get 324.80 sqrt=18.02
The possible answers are: A) 24.5 B) 324.9 C) 18 D) 25.1
I checked all your calculations and found no errors.
(although you wrote your solutions with incorrect use of the "equal' sign)
Here is a webpage, by Wolfram a dependable source,
which explains the difference in the two methods of finding standard deviation.
Check with your text or your instructor whether you divide by N or N-1 .
I also got 19.27 after dividing by 7 and
18.02 after dividing by 8, so I don't know where they get your answers.
forgot to post the webpage.
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