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Load the mars data file on "http://ryantgodwin

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Load the mars data file on "http://ryantgodwin.com/data/mars.csv" with your R. a. What is the first quartile of the "IQ" variable? b. What is the second quartiles of the "IQ" variable? c. What is the third quartiles of the "IQ" variable? d. What is the mean of the "IQ" variable e. Copy and paste the code you used to arrive at your answer.