A sample of the length in inches for newborns is given below. Assume that lengths are normally distributed. Find the 99% confidence interval of the mean length.

17.8395

Length
15.5
20.7
20.1
20.3
19.4
21.5
17.9
22
19.5
21.5

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Do not round in between steps. Round answers to at least 4 decimal places.