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what is the standard deviation for these scores correct to one decimal place

1. The following raw scores were obtained by 30 students on a 100-point test: 40 44 56 94 81 85 76 57 85 45 67 43 60 56 53 85
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Answer #1
sr.no. x x-x̅ (x-x̅)2
1 40 -29.8667 892.0178
2 44 -25.8667 669.0844
3 85 15.13333 229.0178
4 43 -26.8667 721.8178
5 53 -16.8667 284.4844
6 74 4.133333 17.08444
7 46 -23.8667 569.6178
8 85 15.13333 229.0178
9 56 -13.8667 192.2844
10 94 24.13333 582.4178
11 81 11.13333 123.9511
12 76 6.133333 37.61778
13 45 -24.8667 618.3511
14 60 -9.86667 97.35111
15 85 15.13333 229.0178
16 72 2.133333 4.551111
17 96 26.13333 682.9511
18 92 22.13333 489.8844
19 65 -4.86667 23.68444
20 80 10.13333 102.6844
21 85 15.13333 229.0178
22 57 -12.8667 165.5511
23 67 -2.86667 8.217778
24 56 -13.8667 192.2844
25 93 23.13333 535.1511
26 75 5.133333 26.35111
27 66 -3.86667 14.95111
28 93 23.13333 535.1511
29 85 15.13333 229.0178
30 47 -22.8667 522.8844
Total 2096 9255.467
mean=x̅ Total/30
x̅ 69.86667

X = 69.86667 {(x-x} = 9255.467 standard deviation = {(x-7) 2 - 14255.467 30- g255. 467 29 319 .154 standard deviation = 17.9

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