1. ## Probabilty of failure

Hi,

I am having some difficulty working out a solution to this question.

Monitoring a car engine, the rate of occurrence of a fault is 1/15 per year.

Calculate the probability of 0, 1 and 2 faults occurring over a 12.5 year period.

I haven't got a clue how to approach this. I tried several methods but they are wrong.

Thanks!!!!!! Any help would be much appreciated.

2. Originally Posted by jycrowman
Hi,

I am having some difficulty working out a solution to this question.

Monitoring a car engine, the rate of occurrence of a fault is 1/15 per year.

Calculate the probability of 0, 1 and 2 faults occurring over a 12.5 year period.

I haven't got a clue how to approach this. I tried several methods but they are wrong.

Thanks!!!!!! Any help would be much appreciated.
You're probably expected to use a Poisson model (the mean will be 12.5/15 = 5/6).