Stress at work: In a poll conducted by the General Social Survey,81%of respondents said that their jobs were sometimes or always stressful. One hundred and seventy-five workers are chosen at random. Use the TI-84 Plus calculator as needed. Round your answer to at least four decimal places.

(a) Approximate the probability that150or fewer workers find their jobs stressful.

(b) Approximate the probability that more than140workers find their jobs stressful.

(c) Approximate the probability that the number of workers who find their jobs stressful is between146and150inclusive.