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Consider a dataset of towers in every state which is normally distributed

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Consider a dataset of towers in every state which is normally distributed. Consider a sample of 40 towers. The sample data has a mean of 68 with a standard deviation of 15.

How many degrees of freedom we use to find the t-critical statistic value?              

Does Not  Apply

30

40

39

What is Maximal Margin of Error (E) at 99% confidence?              

3.6486

5.769

6.119

Construct a 99% confidence interval.              

(17.231, 28.769)

(3281.951, 3718.049)

(131.3514, 138.6486)

(61.881, 74.119)