Asurvey asked people how they get to work or school based on what kind of area they live in. the results are shown in
the table below. what is the conditional relative frequency of people in urban areas who use public transportation?
10
35
urban suburban rural total
walk
33
bike
15 12
public transportation 22 17
46
drive
6 20 33
total
176
58

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?