Re: [STPM] Maths T needs help!!
I found this question in fajar bakti ace ahead (volume 2)
Exam practise chapter 8
Suppose the time T taken for a car wash is normally distributed with mean 6minutes and standard deviation 1.5 minutes.
c) If 1000 cars are washed, what is the probability that not more than one car takes more than 10.62 minutes.
Answer : 0.3399
Anyone knows how to do it?
I've tried poisson approximation, but i'm still no where near the solution
Last edited by smallkid; 11-03-2010 at 08:34 PM.
Reason: Automerged Doublepost