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.