In a group of 26 students, 16 received credit. came out to the board 4. what is the probability that they have a credit

A big event consists of two small independent ones, here is its formula:
P (C) = P (A) * P (B)

Big event – 1 test and 2 test and 3 test and 4c
Substitute in the formula and get:
P (C) = 1h and 2h and 3h and 4h
And- multiplication
We get:
R (S) = R (1h) * R (2h) * R (3h) * R (4h)

To find a small event:
P (A) = favorable outcomes (m) / number of total outcomes (n)

Maximum value – 1
Since we have two cases here – either a test or not, then we 1/2 = 0.5, this is the probability that they will receive a test or not. It turns out that the probabilities of all small events = 0.5

Now we substitute in our formula:
P (C) = 0.5 * 0.5 * 0.5 * 0.5 = 0.625