See problem 4-27 in the text or look in the glossary for how to make a stem-and-leaf plot.
Refer to the Math Notes box in Lesson 4.2.4 for a reminder of box-and-whisker plots.
Which plot takes into account the median when it is being constructed?
Find 65 on your box-and-whisker plot. Is there any measurement of center in that area? What does that part of the box-and-whisker plot represent? What percentile is that?
Notice that the lower quartile exists at around 65 guesses. The lower quartile is also representative of the 25th percentile.
Approximately 75% of students guessed more than 65 jelly beans.
Determine how many students guessed over 65 jelly beans and how many students there were total.
Explore the problem with the eTool below.
Click the link at right for the full version of the eTool: MC2 5-91 HW eTool