A delivery company provides expected time of arrival. The company wants to provide an accurate suggestion with a 90% confidence level. If the sample size is 50, the sample average is 35 minutes, the standard deviation is 10 minutes, and the z-score is 1.65, what is the confidence interval?

(31.75, 37.82)

(32.67, 37.33)

(33.35, 36.65)

(33.59, 36.41)