40. Stress at work: In a poll conducted by the General Social Survey. 81% of respondents said that their jobs were sometimes or always stressful. Ten workers are chosen at random. a. What is the probability that exactly 7 of them find their jobs stressful? b. What is the probability that more than 6 find their jobs stressful? C. What is the probability that fewer than 5 find their jobs stressful? d. Would it be unusual if fewer than 4 of them find their jobs stressful? e. What is the mean number who find their jobs stressful in a sample of 10 workers? 1 What is the standard deviation of the number who find their jobs stressful in a sample of 10 workers?