The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean o
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Answer:
13.55 hours
Step-by-step explanation:
given that the lifetime of a certain type of battery is normally distributed with mean value 13 hours and standard deviation 1 hour.
Sample size=n =9
Sample mean =
Let c be the lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages
Then we have
Convert into Z score to get
z =1.645 from std normal distribution table
Hence x =
Answer is 13.55 hours