The Lifetime (In Hours)of a 60-Watt Light Bulb Is a Random

question 55

Multiple Choice

The lifetime (in hours) of a 60-watt light bulb is a random variable that has a Normal distribution with  = 30 hours.A random sample of 25 bulbs put on test produced a sample mean lifetime of = 1038.What is the 92% confidence interval estimate for the mean lifetime ?

• A)(1022.1,1053.9).
• B)(1027.5,1048.5).
• C)(1026.2,1049.8).
• D)(1028.1,1047.9).
• E)(1022.5,1053.5).

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