|
xi |
fi |
f ixi |
xi - |
(xi - |
f i(xi - |
|
92 |
3 |
276 |
-8 |
64 |
192 |
|
93 |
2 |
186 |
-7 |
49 |
98 |
|
97 |
3 |
291 |
-3 |
9 |
27 |
|
98 |
2 |
196 |
-2 |
4 |
8 |
|
102 |
6 |
612 |
2 |
4 |
24 |
|
104 |
3 |
312 |
4 |
16 |
48 |
|
109 |
3 |
327 |
9 |
81 |
243 |
|
Total |
22 |
2200 |
640 |
=
=2200/22 = 100
Variance (σ 2) = 640/22 = 29.09
Therefore Standard Deviation (σ ) = 
=5.39
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