Home realty claims it can see a detached, residential house faster than any other realty company. With the aim of examining HOME'S claim, you sample 20 customers who sold a detached, residential house through HOME and record the selling times (in days) of the houses. Your data are summarized in the following histogram:

Frequency

6

4

2

0

5. 4. 6. 3. 2

0-10. 10-20. 20-30. 30-40 40-50

Selling Time (in days)