Pain: The General Social Survey asked 827 people how many days they would wait to seek medical treatment if they were suffering pain that interfered with their ability to work. The results are presented in the following table.

Number of Days Frequency

0 27

1 436

2 263

3 72

4 19

5 10

Total 827

Consider these 827 people to be a population. Let X be the number of days for a person sampled at random from this population.

a. Construct the probability distribution of X.

c. Find the probability that a person would wait more than 2 days.

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?