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A poll asked people, some with, and some without, children under 18 years old if they frequently experienced stress. The results are shown in the accompanying table. Complete parts (a) through (c) below. Note: Your answers to each of these three questions should not be the same. Frequently Experience Stress Yes No Total With child under 313 217 530 18 years No child under 198 322 520 18 years Total 511 539 1050 a. Find the probability that a randomly selected person did not have a child under 18 years old, given that they said Yes. (Type an integer or decimal rounded to four decimal places as needed.) b. Find the probability that a randomly selected person said Yes, given that the person did not have a child under 18 years old. (Type an integer or decimal rounded to four decimal places as needed.) c. Find the probability that a randomly selected person from the group did not have a child under 18 years old and said Yes. (Type an integer or decimal rounded to four decimal places as needed.)