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MathematicsMathematics
26 October, 17:27

Suppose that a customer service center claims that the telephone calls it receives last 112 seconds on average, with a standard deviation of 9 second. If you took a sample of 324 telephone calls, which of the following mean times would be within the 95% confidence interval

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  1. 26 October, 18:11
    0
    For those on apex where the question says 113 instead of the above 112, the answer is 113.5 seconds. : - )
  2. 26 October, 18:56
    0
    112.5 seconds is the answer
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