Question: The number of leasable square feet of office space available in a city on any given day has a normal distribution with mean 640,000 square feet and standard deviation 18,000 square feet. What is the interquartile range for this distribution?
A: 652,000 - 628,000
B: 658,000 - 622,000
C: 667,000 - 613,000
D: 676,000 - 604,000
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.