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A person with type O blood can donate red blood cells to anybody because type O blood is the universal blood type. About 44% of the US population has type O blood. University High held a blood drive where 50 students donated blood.
Part A: What is the probability that exactly 25 of the students had type O blood?
Part B: What is the probability that at least 25 of the students had type O blood?

 Feb 10, 2020

Best Answer 

 #1
avatar+21544 
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Binomial Probability:

 

A:  50C25·(.44)25·(.56)25    =  0.07813

 

B:  50C25·(.44)25·(.56)25 + 50C26·(.44)26·(.56)24 + 50C27·(.44)27·(.56)23 + ... + 50C50·(.44)50·(.56) =  0.237

 

Either find a program to do part B or use the normal approximation for the binomial ...    

 Feb 10, 2020
 #1
avatar+21544 
+1
Best Answer

Binomial Probability:

 

A:  50C25·(.44)25·(.56)25    =  0.07813

 

B:  50C25·(.44)25·(.56)25 + 50C26·(.44)26·(.56)24 + 50C27·(.44)27·(.56)23 + ... + 50C50·(.44)50·(.56) =  0.237

 

Either find a program to do part B or use the normal approximation for the binomial ...    

geno3141 Feb 10, 2020

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