Chapter 3 - Probability - Section 3.1 Basic Concepts of Probability and Counting - Exercises - Page 142: 47

1-\frac{20}{193} =0.8964

Let 'A' is the event of choosing a resident who is 15 to 29 years old Then P(A) = Frequency corresponding to 15 to 29 / Total frequency = 20/193 = 0.1036 Now, The probability of a randomly choosing a resident who is not 15 to 29 years old = 1- P(A) = 1-0.1036 =0.8964