Question

The number of clients arriving at a bank machine is Poisson distributed with an average of 2 per minute. What is the probability that no more than 2 customers will arrive in a minute

Answer 1

The probability that no more than '2' customers will arrive in minute = 1.5412

Explanation:

Explanation:-

Mean of the Poisson distribution 'λ' = 2 per minute

P(X=x) = e⁻ˣ λˣ/x!

The probability that no more than '2' customers will arrive in minute

P(x≤ 2) = P(x=0) +P(x=1)+P(x=2)

= e⁻² (2)°/0! + e⁻²(2)¹/1!+e⁻² (2)²/2!

= 1 + 0.2706 + 0.2706

= 1.5412

The probability that no more than '2' customers will arrive in minute = 1.5412