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 = .2 & q =.8

nCx = 

P(1 of 3 days) =  = .3840

P(0 of 5 days) = = .3277

P(1 of 5 days) = = .4096 

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