Answer:D
Step-by-step explanation:The real mean of the data set is 486. In order to get this number, what you must do is add the Minimum, 1st interquartile range, Median, 3rd interquartile range and the Max.
Max:720
3rd IQ:560
Med:500
1st IQ:400
Min:250
With these numbers, we would add each of them together, then multiply these numbers by how many numbers are shown, and that would be 5 numbers. We would do 720+560+500+400+250 and that would give us 2430. We would divide 2430 by 5, we would get 486. So your answer is D.