Life of bulbs produced by two factories A and B are given below:
The bulbs of which factory are more consistent from the point of view of the length of life?
For Factory A
Now, N=120,
Mean
Variance = 12097
Standard Deviation
SD = 109.98
Coefficients variation =
Cv=13.61
For Factory B
Now, N=120,
Mean
Variance = 11400
Standard Deviation
SD = 106.77
Coefficients variation =
Cv=14.29
Since, the coefficient of variation of factory B is greater than the coefficient of variation of factory A,
Hence, This means bulbs of factory A are more consistent from the point of view of the length of life.