|
Classes |
xi |
fi |
f ixi |
|xi - |
fi|xi - |
|
95-105 |
100 |
9 |
900 |
25.3 |
227.7 |
|
105-115 |
110 |
13 |
1430 |
15.3 |
198.9 |
|
115-125 |
120 |
26 |
3120 |
5.3 |
137.8 |
|
125-135 |
130 |
30 |
3900 |
4.7 |
141 |
|
135-145 |
140 |
12 |
1680 |
14.7 |
176.4 |
|
145-155 |
150 |
10 |
1500 |
24.7 |
247 |
|
Total |
100 |
12530 |
1128.8 |
|
|
=12530/100 = 125.3
M.D () = 1128.8/100 = 11.282
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