For a random sample of 50 measurements on the breaking strength of cotton threads, the mean breaking strength was found to be 210 grams and the standard deviation 18 grams. Calculate a 90% confidence interval for the true mean breaking strength of cotton threads of this type.
Group of answer choices
(205.24, 214.76)
(205.81, 214.19)
(205.45, 214.19)
(205.01, 214.99)
(206.01, 213.99)