multiply the frequency with the absolute value of middle of class less the mean | middle of class less the mean | multiply the frequency with the middle of class | middle of class | width of the class | frequency | weight |
c | f | X | ||||
177.12 | -29.52 | 270 | 45 | 10 | 6 | 40-50 |
234.24 | -19.52 | 660 | 55 | 10 | 12 | 50-60 |
161.84 | -9.52 | 1105 | 65 | 10 | 17 | 60-70 |
9.12 | 0.48 | 1425 | 75 | 10 | 19 | 70-80 |
125.76 | 10.48 | 1020 | 85 | 10 | 12 | 80-90 |
163.84 | 20.48 | 760 | 95 | 10 | 8 | 90-100 |
152.4 | 30.48 | 525 | 105 | 10 | 5 | 100-110 |
121.44 | 40.48 | 345 | 115 | 10 | 3 | 110-120 |
1145.76 | 6110 | 82 | total | |||
mean | mean calculation | |||||
74.52 | 6110/82 | |||||
absolute average deviation | absolute average deviation calculation | |||||
13.97 | 1145.76/82 |
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