# McGraw Hill Math Grade 6 Lesson 25.3 Answer Key Box-and-Whisker Plots

Practice questions available in McGraw Hill Math Grade 6 Answer Key PDF Lesson 25.3 Box-and-Whisker Plots will engage students and is a great way of informal assessment.

Exercises

SOLVE

Question 1.
What is the approximate median of the data in the box-and-whisker plot? A box and whisker plot is defined as a graphical method of displaying variation in a set of data.
From the above plot, we can say that the median is 75.

Question 2.
The middle 50% of the data is between what two values? The minimum value is 65
Maximum value is 100
First Quartile Q1 = 73.5
Third Quartile Q3 = 91.25
Q3 – Q1 = 91.25 – 73.5 = 17.75

Question 3.
What is the range of the data in the box-and-whisker plot? Highest value = 20
Lowest value = 5
Range = 20 – 5 = 15
The range of the data in the box-and-whisker plot is 15.

Question 4.
What is the approximate range of the lowest 25% of the data in the box-and-whisker plot? The left whisker represents the bottom 25% of the data.
So, 152 is the lowest 25% of the data in the box-and-whisker plot.

Question 5.
What is the range of the top 75% of the scores in the box-and-whisker plot? Range: ___________
Q3 is the upper quartile that represents the top 75% of the scores in the box-and-whisker plot.
Range = 20 – 2
Range = 18
So, 18 is the range of the top 75% of the scores in the box-and-whisker plot

Question 6.
What is the range and median of the box and-whisker plot? Range: ___________
Median: ____________
Range = Highest – Lowest
Range = 11 – 6
Range = 5
The median divides the data set into two sets.
So, 8 is the median of the box and-whisker plot.

Question 7.
What is the approximate range of the third quartile? The third Quartile is the upper quartile (Q3) = 12.

Question 8.
What can you determine about the different quartiles in the box-and-whisker plot? The first step in constructing a box-and-whisker plot is to first find the median (Q2), the lower quartile (Q1) and the upper quartile (Q3) of a given set of data.
You are now ready to find the interquartile range (IQR).
The interquartile range is the difference between the upper quartile and the lower quartile.
IQR = 11 – 9 = 2

Question 9.
What can you say about a student who weighs 155 lbs, if he is part of the group below?  