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[" All "32" .The mean life of a sample o...

[" All "32" .The mean life of a sample of "60" bulbs was "650h" and the standard deviation was "8h" .If a second "],[" sample of "80bulbs" has a mean life of "660h" and standard deviation "7h" ,then find the overall standard "],[" deviation."]

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The mean life of a sample of 60 bulbs was 650 hours and the standard deviation was 8 hours. A second sample of 80 bulbs has mean life of 660 hours standard deviation 7 hours . Find the overall standard deviation.

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