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Life of bulbs produced by two factories ...

Life of bulbs produced by two factories A and B are given below: Length of life (in hours):, 550-650, 650-750, 750-850, 850-950, 950-1050 Factory A: (Number of bulbs), 10, 22, 52, 20, 16 Factory B(Number of bulbs), 8, 60, 24, 16, 12 The bulbs of which factory are more consistent from the point of view of length of life?

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  13. The mean deviation for n observations x1, x2, ......... , xn from thei...

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  15. If the standard deviation of a variable X \ is \ sigma , then standard...

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