the weight of 30 students of class are given below find mean by deviation method
c.I. 40-45,45-50,50-55,55-60,60-65,65-70,70-75
frequency. 2,3,8,6,6,3,2
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class. fi. xi. di. ui. fiui.
40-45. 2. 42.5. -15. -3. -6
45-50. 3. 47.5. -10. -2. -6
50-55. 8. 52.5. -5. -1. -8
55-60. 6. 57.5. 0. 0. 0
60-65. 6. 62.5. 5. 1. 6
65-70. 3. 67.5. 10. 2. 6
70-75. 2. 72.5. 15. 3. 6
____. _____
£ fi=30. £fiui=-2
Here a = 57.5
By formula
Mean = a + h(£fiui/ £fi)
=57.5 +5(-2/30)
= 57.5 +(-10/30)
= 57.5 - 0.33
= 56. 17
Therefore the mean of to the given data is 56.17
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