Question

No idea how to do this, please explain?
The two box plots show the scores from Mrs. Clark's first and second blocks on a 60 point assignment. What is the interquartile range for first block?
http://roads.advancedacademics.com/contentserver/content/roadssection/277518/questions/6exam/6exam_q41.bmp

A. 35
B. 15
C. 30
D. 10

Answer 1

Hint:

IQR = Q3 - Q1

Answer 2

but i still can't find the Q3 and the Q1

Answer 3

Q3 is the 3rd quartile and it is visually represented by the right edge of the box

Answer 4

Q1 is the first quartile and it is visually represented by the left edge of the box

Answer 5

so the ends of the box?

Answer 6

exactly

Answer 7

IQR = width of the box

Answer 8

and what does the red line represent?

Answer 9

that's the median

Answer 10

or Q2 (second quartile)

Answer 11

oh ok thanks so much! i got 15 :)

Answer 12

it is 15, good job

Answer 13

appreciated!

Answer 14

yw