InfoPath Dev

I am looking for a Boolean rule that determines if a value is >= to 4 and <= 7.  How would I write this statement? 

Here's a sample form - there is a calculated value on the form with the expression for this. Save the attached file locally, right click the saved file and select Design. Then you can preview and check it out.

 As always, thank you Hilary.  I did find this solution:

boolean(.. >= 5 and .. <= 7) or boolean(.. >= 15 and ..<=16) or boolean(.. = 25)