. Mrs. Olson has to find the class average for the last test she gave. She also needs to give the school principal information about how well the class is doing. The test scores were 99, 92, 45, 90, 65, 54, 68, 75, 77, 86, 85, 72, 38, 85, 91, 85, 10, 70, 65, and 73. Homework Help ✎
Make a stem-and-leaf plot of the test scores.
Find the mean, median, and mode of the scores.
Which measure do you think most fairly represents how well the class is doing? Explain.
Refer to the Math Notes box below for a reminder of how to create a stem-and-leaf plot.
Remember that the mean, or average, is calculated by adding all values and dividing by the number of values. The median is the middle number, and the mode is the most frequently repeated number of the data set.
The mean is 71.25, the median is 74, and the mode is 85.
Be sure to explain your answer and write down what you think!