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? 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 d. When n= 30 or more statictice herauce they

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