Answer
$20$% of the Saturdays had 5 or less customers waiting for a table.
Work Step by Step
In this case, 5 or fewer customers means 5, 4 or 3 customers since no Saturdays had less than 3 customers waiting for a table.
$2+3+3=8$ Saturdays had 5 or less customers waiting for a table.
The relative frequency: $\frac{8}{40}=0.20=20$%
