Question

The box plot represents the scores on quizzes in a history class.

A box plot uses a number line from 69 to 87 with tick marks every one-half unit. The box extends from 75 to 82 on the number line. A line in the box is at 79. The lines outside the box end at 70 and 84.

What value does 25% of the data lie below?

(A) the lower quartile (Q1) and it is 75
(B) the lower quartile (Q1) and it is 79
(C) the upper quartile (Q3) and it is 82
(D) the upper quartile (Q3) ans it is 84​​

Answer 1

• (A) the lower quartile (Q1) and it is 75

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The lower end of the box represents the 25th percentile or lower quartile, which is also known as Q1.

According to the given box plot the Q1 is at 75, hence the matching answer choice is (A).