Forbes ranked 120 US cities according to their quality of life. The results are shown in the partial contingency table, Where A is less than 15% with college degrees, B is 15% to 20%with college degrees and C is over 20% with college degrees.

Quality of life

Percentage with college degrees

Poor

Good

Excellent

Total

A

10

20

40

B

20

C

10

20

Total

20

60

a.Complete the contingency table.

b.Given a rank ofExcellent, which of the three percentages is most likely to occur?

If a city is ranked as Good, how likely is that over 20%