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1.1,000 light bulbs with a mean life of 120 days are Installed in new factory their length of life is normallydistributedwithstandarddeviation20days How may bulbs will

1.1,000 light bulbs with a mean life of 120 days are Installed in new factory their length of life is normallydistributedwithstandarddeviation20days

How may bulbs will Expire in less then 90 days? If it is decided to Replace all the bulbs together what intervals should be allowed between replacements if not more than 10 percent should Expire before replacement.

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