#### Answer

16.7 %

#### Work Step by Step

People with an average checking balance between 0 and 100 is 5.
People with an average checking balance between 101 and 200 is 9.
People with an average checking balance between 201 and 300 is 5.
People with an average checking balance between 301 and 400 is 6.
People with an average checking balance between 401 and 500 is 2.
People with an average checking balance of over 500= 3.
Total number of people polled=30.
% of people with an average checking balance between 201 and 300 is $\frac{5}{30}\times100=16.7 $%.