## JonnyBaybee 3 years ago Assume that 1 car in 8 is defective and will not start. If at different times 5 individuals each randomly select a car to test drive, what is the probability that at least 1 of them selects a car that will not start?

1. JonnyBaybee

No, that wasn't the answer. This question is in a section over Bernoulli Trials.

2. mubzz

The collective probability of any event cannot exceed 1. At least one of them selects a defected car means that there can be more than one defected cars picked. So, probability of at least 1 defective car = 1 - (probability of no defective cars) For one person's pick, probability of non-defective car = 7/8. For five different draws, this will be (7/8)^5 Therefore, =>probability of at least 1 defective car = 1 - ((7/8)^5) =>probability of at least 1 defective car = 1 - (16807/32768) =>probability of at least 1 defective car = 1 - 0.5129 =>probability of at least 1 defective car = 0.4871

3. mubzz

4. Zarkon

yes

5. JonnyBaybee

Mubzz thank you yes!!

6. JonnyBaybee

I thought it was somewhere along that line but i didnt subtract (7/8)^5 from 1. Thats why i didnt get it thank you again!!