X Quiz 3
Find the interquartile range (OR) of the data in the dot plot below
Cm
Height for each toddler
Mrs. Orlando's daycare
.
80
81
82 83 84 85
Height centimeters)
86
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IQR = 0.5

first we’ll put the data set in ascending order:

81, 82, 83, 83, 84, 84, 84, 85

Then find the median (middle number) since there are two, 83 and 84, we average them: 83.5

The first quartile is the middle number of the bottom half of the data set (bottom half = 81, 82, 83, 83) again, we’ll average, so 82.5

The third quartile is the middle number of the top half of the data set. (Top half = 84, 84, 84, 85) So third quartile is 84.

IQR is the difference between the first and third quartiles. 84 - 83.5 = 0.5

Please lmk if you have questions