Listed below are speeds​ (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at​ 3:30

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Listed below are speeds​ (mi/h) measured from traffic on a
busy highway. This simple random sample was obtained at​ 3:30
P.M. on a weekday. Use the sample data to construct a 90​%
confidence interval estimate of the population standard
deviation.
61
62
62
57
62
52
59
58
59
69
58
66
The confidence interval estimate is ____
​mi/h<σ<____​mi/h