[Math4u] Poisson probablity distribution trick

The manager of Glories PLC(some company) is planning to stock and
advertize a very expensive CD player.The manager expect to draw 250
interested customers and asses the probablity of selling a CD Player to
a customer at 0.02.What then will be the probablity of

a)being able to satisfy the customer demand.
b)not being able to satisty the customer demand.

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