c. 40 O d. 100 6. The distribution of exam scores in a population is normal with a mean of 81 points and a standard deviation of 2.2. Under what conditions would a sampling distribution of means approximate the shape of a normal distribution? O O a. The sampling distribution will always approximate the shape of the normal distribution. b. The sampling distribution will never approximate the shape of the normal distribution. c. When n= 100 or more O d. When n = 30 or more il in statistics because they