|
xi |
yi = xi - 64 |
f i |
f i y i |
f i y i2 |
|
60 |
-4 |
2 |
-8 |
32 |
|
61 |
-3 |
1 |
-3 |
9 |
|
62 |
-2 |
12 |
-24 |
48 |
|
63 |
-1 |
29 |
-29 |
29 |
|
64 |
0 |
25 |
0 |
0 |
|
65 |
1 |
12 |
12 |
12 |
|
66 |
2 |
10 |
20 |
40 |
|
67 |
3 |
4 |
12 |
36 |
|
68 |
4 |
5 |
20 |
80 |
|
Total |
100 |
0 |
286 |
=
= 64
Variance (σ 2) = [(1)2/100][0× 286 -0] = 2.86
Therefore Standard Deviation (σ ) = 
=1.691
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