A survey conducted fo the northwestern national life insurance company revealed that 70% of american workers say job stress caused frequent health problems. one in three said they expected to burn out in the job in the near future. thirty- four percent said they thought seriously about quitting their job last year because of work place stress. Fifty- three said they were required to work more than 40 hours a week very often or somewhat often.
a) Suppose a random sample of 10 American workers is selected. What is the probability that more than seven of them say job stress caused frequent health problems? ______________ {ROUND UP TO THE NEAREST DECIMAL}
What is the expected number of workers who say job stress caused frequent health problems? ____________ {ROUND UP TO THE NEAREST INTEGER}
b) Suppose a random sample of 15 American workers is selected. What is the expected number of these sampled workers who say they will burn out in the near future? _____________(Round to the nearest integer.)
What is the probability that none of the workers say they will burn out in the near future? ____________ (Round to 4 decimal places.)
c) Suppose a sample of seven workers is selected randomly. What is the probability that all seven say they are asked very often or somewhat often to work more than 40 hours a week? ___________(Round to 4 decimal places.)