Math 50 – Section #4.3 Name ____________________
Boxplots
Professor Jason Wang
1. The boxplot below represents the exam scores from a statistics class.
Use the boxplot to answer each of the following questions.
(a) Estimate the score for the 75th percentile:
(b) The 75th percentile is also called the quartile
(c) The left whisker covers up to the percentile.
(d) The percentage of students scoring less than 60 is approximately .
(e) The percentage of students scoring more than 70 is approximately .
(f) If there were 60 students who took this exam, estimate the number that
scored between 70 and 90. Write your answer by using a complete sentence.
(g) If there were 60 students who took this exam, estimate the number that
scored less than 90. Write your answer by using a complete sentence.
2. The boxplots below compare the prices of hardcover and softcover textbooks.
Use this information to answer each of the following questions.
Use appropriate units whenever applicable.
(a) Estimate the minimum price of each type of book.
Paperback: Hardcover:
(b) Which has the higher mean?
(c) Estimate the range of prices for paperback books:
(d) Pretend that a distribution was drawn of the prices of the paperback
books. Describe the appearance of the distribution.
3. The below data represents the ride duration of wooden roller coasters in Ohio
63 90 90 93 105 120 140 193 250
Using this data, construct a boxplot for this data set. Make sure that you clearly
label the tick marks on the horizontal axis!