A random sample of 300 ATM transactions at the Last National Bank of Flat Rock revealed a mean transaction time of 64.2 seconds with a standard deviation of 10.5 seconds. The margin of error (in seconds) of the 95 percent confidence interval for the true mean transaction time is?

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A random sample of 300 ATM transactions at the Last National Bank of Flat Rock revealed a mean transaction time of 64.2 seconds with a standard deviation of 10.5 seconds. The margin of error (in seconds) of the 95 percent confidence interval for the true mean transaction time is? 

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THE KNOWNS ARE:

n= 300

x bar=64.2

s= 10.5

CI= 95%

what is the margin of error

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