5. (20 points) A safety engineer claims that only 10% of all workers wear safety helmets during the lunch time at the fa

[answerhappygod]

5 20 Points A Safety Engineer Claims That Only 10 Of All Workers Wear Safety Helmets During The Lunch Time At The Fa 1 (39.93 KiB) Viewed 22 times

5. (20 points) A safety engineer claims that only 10% of all workers wear safety helmets during the lunch time at the factory. Assuming that this claim is right, in a sample of 12 workers, what is the probability that (a) (8 points) exactly 4 workers wear their helmets during the lunch? (b) (8 points) less than 2 workers wear their helmets during the lunch? (c) (4 points) Find the expected number of workers that wear safety helmets during the lunch.