Question

The probability that Janice will attend math class today is 62%. The probability that Ellie will attend math class if Janice attends is 100%. Ellie will not attend the class unless she hears from Janice first. What is the probability that both will attend the class? 73% 100% 81% 62%

Answer 1

Essentially, we know that every time Janice attends, Ellie will be there, too, every time (this is what 100% probability means).

So the question of the probability of them both attending is the same as only Ellie attending, which is 62%! so the answer is also 62%!