SOLUTION: a certain insecticide kills 50% of all insects in lab experiments a sample of 11 insects is exposed to the insecticide in a particular experiment what is the probability that exact

Question 375390: a certain insecticide kills 50% of all insects in lab experiments a sample of 11 insects is exposed to the insecticide in a particular experiment what is the probability that exactly 6 insects will survive
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi,

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



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

In this case p & q are = 1/2 or .5

nCx =   11C6 = 462    

P(exactly 6 surviving)=  462*(.5)^6(.5)^5 = .2256 

 

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