Question: The time between failures for a certain device is normally distributed with a standard deviation of 29.9 days. The manufacturer of the device would like

The time between failures for a certain device is normally distributed with a standard deviation of 29.9 days. The manufacturer of the device would like to obtain a confidence interval estimate for the mean time between failures using the formula xz

n. If the manufacturer uses 1.4 for the value ofz, what is the confidence level for theinterval? (Round to the nearest

tenth of apercent).

A.96.2%

B.91.9%

C.83.8%

D.98.5%

E.None of the above

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