The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the population standard deviation of the checkout time is one minute. The 95% confidence interval for the average checkout time of all customers is

3 to 5

1.36 to 4.64

2.804 to 3.196

1.04 to 4.96