A survey asked two age groups about the car color that they most preferred. The results are shown in the table below.
Age 16-24 Age 25 40 Total
Black 30
Blue
18
Brown
15
Red
26
Silver 5
21
White 18
31
Total
118
168
286
Of the total people surveyed, what is the relative frequency of 25-40 year olds who preferred silver cars?