Assume that each time a metal detector at an airport signals

Assume that each time a metal detector at an airport signals, there is a 25% chance that the cause is change in the passenger’s pocket. During a given hour 15 passengers are stopped because of signal from the metal detector. Find the probability that at least 2 passengers will have been stopped due to change in their pockets.

(Define r.v of the problem determine its type and then compute the probability)

Solution