Given a worn machine that creates defects at the average rate of 5 units per hour, what 's the probability of no defects occurring in any specific hour? What's the probability of 8 or more defects in any hour?
Here it is given that average rate is 5 units per hour.
So that λ= np = 5,
Let X be the number of defects per hour.
Poisson formula is P(X = x) = (see attached)
This solution determines the probability of 8 or more defects in an hour at a machine.