







A binomial probability question 
20191008 

From venni: The Medassist Pharmaceutical Company receives large shipments of aspirin
tablets and uses this acceptance sampling plan: Randomly select and test 24
tablets, then accept the whole batch if there is only one or none that doesn’t
meet the required specifications. If a particular shipment of thousands of
aspirin tablets actually has a 4% rate of defects, what is the probability that
this whole shipment will be accepted? Answered by Penny Nom. 





A binomial probability problem 
20080108 

From rougi: According to statistics of the company about 4% of the people who buy tickets do not arrive to the flight . The company sells 205 tickets to plane that has 200 places . Use the binomial distribution to calculate what is the probability that all the people who come to the flight get a place. Answered by Harley Weston. 





Colour blindness 
20070329 

From Katrina: 9% of men and .25% of woman can't distinguish between
the colors red and green. This is the type of color blindness
that causes problems with traffic lights. If 6 men are randomly
selected for a study of traffic signal perceptions, find the probability
that exactly two of them cannot distinguish between red and green. Answered by Stephen La Rocque. 





Three keys 
19981126 

From Karen Chan: A man has a bunch of three keys, only one of which fits the lock of his front door. When he comes home in the dark he tries the keys at random until he finds the one fits. Find the probability that in a week of five nights, he tries the right key first on at least one night. Answered by Penny Nom. 

