Poisson Distribution

Question 1

when a data set has poison distribution?

Answer 1

Poisson distribution is a discrete probability distribution that models the number of events occurring in a fixed interval of time or space if these events occur independently and at a constant average rate.

Question 2

the probability that k will occur is given by:
(The probability mass function (PMF) of the Poisson distribution is given by k)

Answer 2

P(X=k)=(e^(−λ)∗λ^k)/k!

λ: avr n° of occurrences of ran. event (para. of the distr.)
e: 2.7183.

only that event happends, it need to be added by other to give the result