- The number of defects per metre in a roll of cloth has a Poisson distribution with mean 0.25
Find the probability that
- a randomly chosen metre of cloth has 1 defect,
- the total number of defects in a randomly chosen 6 metre length of cloth is more than 2
A tailor buys 300 metres of cloth.
- Using a suitable approximation find the probability that the tailor's cloth will contain less than 90 defects.