+73 
Given the histogram of customer satisfaction scores, which of the following has to be true?
I. The median rating is at least 4 and less than 6.
II. 30% of the respondents gave an Excellent rating.
III. Half of the respondents gave a Good or Excellent rating
IV. The total number of Good and Excellent ratings equals the total number of Poor and Unacceptable ratings.
Explain your thinking.
