The Laketown Senior Center recorded how many times its members use the center's fitness facilities during a typical month. They organized their data into the following chart.
![1868_92ce8f80-869c-437c-865b-b1f997f42de4.png](https://secure.tutorsglobe.com/CMSImages/1868_92ce8f80-869c-437c-865b-b1f997f42de4.png)
a. How many members used the center's fitness facilities during the month?
b. Estimate the mean of the data.
c. What is the median class of the data?
d. Estimate the median of the data.