Hi,

Two students, Bob and John are registered for the same class and attend 

independently of each other, 

Jim 95.1% of the time and Joan 83.9% of the time. 

 P(at least one not in class) =  1 - P(both in class) = 1 - .951· .839

 P(Jim 'and' Joan not in class) =  .49 · .61 

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