The following data give the numbers of text messages sent by a high school student on 40 randomly selected days during 2012:

a. Calculate the values of the three quartiles and the interquartile range. Where does the value 49 fall in relation to these quartiles?
b. Determine the approximate value of the 91st percentile. Give a brief interpretation of this percentile.
c. For what percentage of the days was the number of text messages sent 40 or higher? Answer by finding the percentile rank of 40.

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