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Keith tabulated the values for the average speeds on each day of his road trip as 61.5, 62.2, 55.7, 50.6, 71.3, 70.8, and 66.8 mph.

Keith tabulated the values for the average speeds on each day of his road trip as 61.5, 62.2, 55.7, 50.6, 71.3, 70.8, and 66.8 mph. Hewishes to construct a 90% confidence interval.

What value of t* should Keith use to construct the confidence interval?Answer choices are rounded to the thousandths place.

1.555

1.220

1.645

1.175

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