Hi,

1) The probability that a person is immune to a certain disease is 0.40.

Note: The probability of x successes in n trials is: 

P = nCx*  where p and q are the probabilities of success and failure respectively.

 nCx = 

 a)what is the probability that 4 people will have the disease in a sample of 12 people?  (.6)^4(.4)^8 

 b)find the mean number of people who have immunity in a sample size of 12. m = 

 c) find the standard deviation for the sample size  SD =   

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