# Life of bulbs pro

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.

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