Step 6: For the Error Condition Formula, you want to prevent the record from being saved for an Exhaust Port Inspector with a utilization of less than 150%. Enter the formula as AND(Name = "Exhaust Port Inspector", Utilization__c < 1.5).

I created the formula but receive the following error:
Step Not yet complete... here's what's wrong:
The validation rule does not appear to have the correct error formula. Make sure Exhaust Port Inspectors have > 150% utilization'
Note: you may run into errors if you've skipped previous steps.

So I changed the formual to the following: AND(Name="Exhaust Port Inspector", Utilization__c>1.5), but still receive the same error message.