|
Classes |
xi |
fi |
f ixi |
|xi - |
fi|xi - |
|
0-10 |
5 |
6 |
30 |
8.5 |
51 |
|
10-20 |
15 |
8 |
120 |
1.5 |
12 |
|
20-30 |
25 |
14 |
350 |
11.5 |
161 |
|
30-40 |
35 |
16 |
560 |
21.5 |
344 |
|
40-50 |
45 |
4 |
180 |
31.5 |
126 |
|
50-60 |
55 |
2 |
110 |
41.5 |
83 |
|
Total |
100 |
1350 |
777 |
|
|
=1350/100 = 13.5
M.D (
) = 777/100 = 7.77
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