What Do Q1 and Q3 Represent in a Data Set?

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what would Q1 and Q3 mean? I can't answer these questions until I know what these columns represent.

Is Q1 the lowest grade given and Q3 the highest?
 
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  • Table of a five-number summary for Quiz 1 and Quiz 2 with columns Minimum, Q1, Median, Q3 and Maximum; Quiz 1 is 15, 35, 55, 85, 100 and Quiz 2 is 20, 35, 50, 90, 100, followed by three questions (a) to (c).
    Screen Shot 2016-05-07 at 10.14.44 PM.png
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elove said:
what would Q1 and Q3 mean? I can't answer these questions until I know what these columns represent.

Is Q1 the lowest grade given and Q3 the highest?

Hi elove! ;)

Q1 is the first quartile. It means that 25% scored lower than the given score.
Similarly Q3 is the 3rd quartile.
The median is the same as Q2.