Question 12 4 pts Suppose a certain species bird has an average weight of x = 3.85 grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with a = 0.29 grams. For a small group of 17 birds, find a 75% confidence interval for the average weights of these birds. 3.77 grams to 4.18 grams O 2.70 grams to 4.18 grams 3.52 grams to 3.93 grams 3.77 grams to 3.93 grams O 2.70 grams to 3.93 grams