For example: The dot plot shows the number of different types of cupcakes available on different days.
Find the mean and median for the number of types of cupcakes available per day.
Solution:
Data set represented by the dot plot: 5, 7, 7, 9, 9, 11, 11, 11, 11
Mean = Sum of all data point/number of data points
= (5+7+7+9+9+11+11+11+11)/9
= 81/9
= 9
Number of data points is 9. The middle value of 5, 7, 7, 9, 9, 11, 11, 11, 11 data set is 9.
Therefore, the mean is 9 and the median is 9.