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Home > MC2 > Chapter 5 > Lesson 5.3.1 > Problem 5-91

  1. Edwin's friends guessed how many jelly beans were in a jar at his birthday party. Here are their guesses. 5-91 HW eTool (CPM) Homework Help ✎.

    75, 80, 95, 92, 100, 72, 71, 60, 65, 88, 60.

    1. Make a stem-and-leaf plot to display the data.

    2. Make a box-and-whisker plot to display the data.

    3. Which data display most clearly shows the median of the data? What is the median?

    4. Based on the box-and-whisker plot, estimate what percent of students guessed more than 65 jellybeans.

    5. Use the stem-and-leaf plot to determine the actual percent of students who guessed more than 65 jellybeans.

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.

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