SOLUTION: Break-downs occur on an old car with a rate of 6 break-downs every four weeks. The owner of the car is planning to have a trip on his car for 4 days. What is the probability that h

Algebra ->  Probability-and-statistics -> SOLUTION: Break-downs occur on an old car with a rate of 6 break-downs every four weeks. The owner of the car is planning to have a trip on his car for 4 days. What is the probability that h      Log On


   

Question 1131491: Break-downs occur on an old car with a rate of 6 break-downs every four weeks. The owner of the car is planning to have a trip on his car for 4 days. What is the probability that he will return home without experiencing a car break-down?



(Please round your answer to four decimal places if necessary. Thank you!)
Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

if an old car with a rate of 6 break-downs every four+weeks that is 6 per 28 days
so that would be 6%2F7 per four days

parameter is 6%2F7, so probability of 0 is e%5E%28-6%2F7%29=0.4244

Answer by ikleyn(52817) About Me  (Show Source):
You can put this solution on YOUR website!
.
6 break-downs every four weeks = 6 break-downs every 28 days = 6%2F7 break-downs every 4 days  ====>  


the probability do not have a break-down in 4 days is the COMPLEMENT to 6%2F7 = 1 - 6%2F7 = 1%2F7.      ANSWER

Solved.