The following frequency distribution shows the distribution of delivery times (in days) for swimstuff.com customer orders during the last month. 
For 300 observations, our rule-of-thumb for number of classes would indicate 9 classes. In this case what is the class interval and why would it be reasonable to use that class interval and only 6 classes?
Definitions:
Line of Credit
A flexible loan from a bank or financial institution that offers a borrower the ability to draw funds as needed, up to a specified limit.
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