In a group of 140 people, 90 have an age of more 30 years, and the others have an age of less than 20 years. If a person is selected at random from this group, what is the probability the person's age is less than 20?  Choose the correct choice from the following choices:  A) 0.35  B) 0.55  C) 0.65  D) 0.75  E) 0.85

Rationale: "number of people whose age is less than 20 is given by 140 - 90 = 50 probability p that a person selected at random from the group is less than 20 is given by 50 / 140 = 0.35 correct answer a"
Answer: A