Suppose that a customer service center claims that the telephone calls it recieves last 113 seconds on average, with a standard deviation of 9 seconds. if you took a sample of 324 phone calls, which of the following mean times would be within the 95% confidence interval?
A. 116.5 seconds
B. 114.5 seconds
C. 113.5 seconds
D. 115.5 seconds
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