The probability of a lost time accident for any particular day is 0.002.  What is the probability of have 2...

1.  The probability of a lost time accident for any particular day is 0.002.  What is the probability of have 2 or more accidents in 180 days?

1. A number of power supplies are tested for a combined total of 5000 hours and during that time there are 3 failures.

1. • What is the failure rate in failures/hour?
   • What is the probability of a power supply running for 2000 hours without a failure?
   • What is the probability of more than 2 failures in 2000 hours?

3.  Electronic circuit failures can be assumed to fail in a normal distribution.  The mean time to failure is 1500 hours and the standard deviation is 150 hours. 
• What is the probability of a circuit not failing in 1200 hours?
• What is the probability of failing between 1300 and 1600 hours?
• What is the probability of failing after 1100 hours?
• What is the probability of failing before 1100 hours?

 4.  The probability of a failure of a small system is 5x10E-4.  What is the probability of getting 2 or more failures if the system is operated for 5000 hours?

• 5. An aircraft door may come unlatch during a flight with a probability of 3x10E-6.  What is the probability of a door becoming unlatched in 1000 flights?