Center

Enrique is a volunteer worker at the local blood-donor center. According to the American Red Cross, 42% of blood donors have type O blood. Enrique is also a medical student and is doing a project as part of his studies. He will record the blood type for 150 randomly selected blood donors at the center. What is the probability that the sample proportion of donors with type O blood is between 35% and 50%?

first set up into a proportion:

x/150 = 42/100

then cross multiply
100x=6300

x= 63%

One Response

1. krystal Q Says:
   December 29th, 2009 at 7:12 pm

   first set up into a proportion:

   x/150 = 42/100

   then cross multiply
   100x=6300

   x= 63%
   References :

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