X Statistics The following table gives the life time of 200 bulbs Calculate the mean life time of a

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The following table gives the lifetime of 200 bulbs.Calculate the mean life of a bulb by step deviation method.

Life time in hrs No. of bulbs
400 - 499 24
500 - 599 47
600 - 699 39
700 - 799 42
800 - 899 34
900 - 999 14

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