The correct answer is C. 0.
A normal distribution is a continuous probability distribution that is symmetrical about the mean, median, and mode. It is often called the “bell curve” because of its characteristic shape. The skewness of a distribution is a measure of how much it deviates from symmetry. A distribution with a positive skew is skewed to the right, while a distribution with a negative skew is skewed to the left. A distribution with zero skew is perfectly symmetrical.
The normal distribution has a skewness of zero. This is because the mean, median, and mode are all equal in a normal distribution. Therefore, there is no deviation from symmetry.
The other options are incorrect because they do not describe the skewness of a normal distribution. Option A is incorrect because a normal distribution is not skewed to the right. Option B is incorrect because a normal distribution is not skewed to the left. Option D is incorrect because the skewness of a normal distribution is defined.