Due to the high incidence of crime, a company is giving its employees new and secured access to the company. Instead of leaving the doors open, they are installing a card system.  To open the door, employees must insert a card into a slot.  If a green light comes on, it is okay to turn the handle and open the door; if a yellow light comes on it indicates the door is locked from inside and you cannot enter.  Suppose that 90% of the time when the card is inserted, the door should open because it is not locked from the inside.  When the door should open, the system makes errors 2% of the time.  That is, the green light will appear 98% of the time.  When the door should not open, the system makes errors 5% of the time (green light appears).  Suppose you inserted the card, and the light is green, what is the probability the door will open?

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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  1. Due to the high incidence of crime, a company is giving its employees new and secured access to the company. Instead of leaving the doors open, they are installing a card system.  To open the door, employees must insert a card into a slot.  If a green light comes on, it is okay to turn the handle and open the door; if a yellow light comes on it indicates the door is locked from inside and you cannot enter.  Suppose that 90% of the time when the card is inserted, the door should open because it is not locked from the inside.  When the door should open, the system makes errors 2% of the time.  That is, the green light will appear 98% of the time.  When the door should not open, the system makes errors 5% of the time (green light appears).  Suppose you inserted the card, and the light is green, what is the probability the door will open?
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