![Normal intersection](/sites/default/files/styles/medium/public/thumbnails/content-id-6484-icon.png?itok=6oK4rUSZ)
Normal distribution
![Normal intersection](/sites/default/files/styles/medium/public/thumbnails/content-id-6484-icon.png?itok=6oK4rUSZ)
![Aim high](/sites/default/files/styles/medium/public/thumbnails/content-id-6437-icon.jpg?itok=4n0tAi22)
![Into the normal distribution](/sites/default/files/styles/medium/public/thumbnails/content-id-6314-icon.jpg?itok=t4OaOjH_)
![Over-booking](/sites/default/files/styles/medium/public/thumbnails/content-id-4932-icon.jpg?itok=SrOsmYIF)
problem
Over-booking
The probability that a passenger books a flight and does not turn
up is 0.05. For an aeroplane with 400 seats how many tickets can be
sold so that only 1% of flights are over-booked?