Answer
$27.5$% of the Saturdays had 10 or more customers waiting for a table.
Work Step by Step
In this case, 10 or more customers means 10, 11, 12, 13 or 14 customers since no Saturdays had more than 14 customers waiting for a table.
$4+4+0+2+1=11$ Saturdays had 10 or more customers waiting for a table.
The relative frequency: $\frac{11}{40}=0.275=27.5$%
