Final answer:
If a positively skewed distribution has a median of 30, the range is less than 30.
Step-by-step explanation:
In a positively skewed distribution, the mean is greater than the median, and the median is greater than the mode. Therefore, option A is false as the mean is greater than 30. Option B is false as well since the mean is greater than 30. Option C is also false as the mode is less than 30. Option D is true because the range can be any value, and it is not directly related to the skewness of the distribution.