Question 3 1 pts Assume the number of Covid-19 infections per 100,000 people in medium-sized Indian cities in December 2020 is normally distributed with an unknown mean and an unknown standard deviation. A random sample of 25 cities in that month gives a mean number of infections of 2570 and a standard deviation of 9. What is the 90% confidence interval for the population standard deviation of infections? O (2587.64, 2552.36) O (7.31, 11.85) O(155.57, 437.08) [15.10, 48.61]