$8$ students take an exam.
All of them are prepared average, so probability that they will pass or fail is the same.
After checking half of the tests, it's discovered that $3$ of them passed and $1$ failed.
What is probability that in the next $3$ tests, $1$ will pass and $2$ will fail
If $A$ is event in which $1$ out of checked $4$ has passed and $2$ have failed and $B$ is event in which $3$ out of checked $4$ have passed and $1$ has failed then that two events are independent??