SOLUTION: In Texas 75% of all drivers wear their seat belts. A) Out of 160 drivers, what is the expected number who are wearing their seat belts? B) How many drivers will need to be ob

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Question 363430: In Texas 75% of all drivers wear their seat belts.
A) Out of 160 drivers, what is the expected number who are wearing their seat belts?
B) How many drivers will need to be observed in order to be 99.5% certain of observing more than two wearing their seat belts?
Thank you in advance.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
A)0.75%2A160=120
B)We have to solve the equation . The closest value of n that would work for this is n = 8:
.