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It is 0.02
1/26
Assuming the choices are made randomly and that the chosen people are not returned to the class, the probability is 77/690 = 0.1116 approx.
a black one
As all the angles in a square measure 90°, the probability of 2 randomly chosen angles being congruent is 1.
The probability is 0.4231, approx.
It is approx 78.8%
1 in 13
It is 3/8.
It is 0.02
2/4
1/26
0.7881 approx.
The probability is 7:12... There are five months with less than 31 days, so the probability of selecting a month with exactly 31 days is 7 out of 12.
Empirical
50%
There are infinitely many numbers and so the probability of the second event is 0. As a result the overall probability is 0.