Mathematics, 22.11.2019 03:31 j4ckd4ws
Aresearcher (jack) comes to you and is interested in the average length of time a computer fan will run before it needs to be cleaned. jack believes that this time period is approximately normally distributed with a standard deviation of 30 hours. you tell him to take a sample of computer fans. jack comes back to you and says that he took a random sample of 36 computers, and found that the average length of time was 876 hours. use a 94% confidence interval.
Answers: 3
where 
=9.4
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