379.88 is the answer to this problem.
You do not have enough information because you need to know how many students are in the class to be able to divide them into 4 equal groups we do know that it has to be a positive integer that can be evenly divided by 4
The probability is 5/9.
The probability that he teleports at least once per day is the same as 1 - (probability he doesn't teleport). The probability that he doesn't teleport in the morning is 2/3; in the evening it is 2/3. This means the probability he doesn't teleport at all that day is (2/3)(2/3) = 4/9. The probability he teleports at least once that day, then, is 1-4/9 = 5/9.
100/45 = 2.2222222
so it is
2 10/45
