please send me the correct answer

A researcher wants to know how long it takes, on average, for a certain species of bacteria to divide. She watches 23 cells through a microscope and times how long it takes them to divide. She obtains the following data, in hours: 6.3, 7.4, 6.3, 7.7, 6.7, 6, 8. , 6.3, 6.7, 5.9, 5.7, 6.3, 6.4, 6.8, 7.1, 7.1, 6.2, 8.4, 8.3, 6.4, 7.3, 7, 5.6 Assuming the population standard deviation is a = 1.2, construct a 90% confidence interval for the average time it takes this species of bacteria to divide. .34 l We are 90% condent that this species of bacteria takes, on average, between l l hours and I l hours to divide