You are chatting with the principal of a local high school. The topic of SAT scores comes

Question:

You are chatting with the principal of a local high school. The topic of SAT scores comes up, and the principal mentions that SAT scores at the school are normally distributed. She doesn't remember the mean or the standard deviation, but she does remember that the first and third quartiles are 500 and 600. The standard deviation of SAT Verbal scores is closest to?