Question

На экзамене 50 билетов, Валера не выучил 7 из них. Найдите вероятность того, что ему попадётся выученный билет

Answer 1

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Answer 2

Calculation of Probability

To find the probability that Valera will get a ticket he has studied, we need to know the total number of tickets and the number of tickets he has not studied.

Given: - Total number of tickets: 50 - Number of tickets Valera has not studied: 7

To calculate the probability, we can use the formula:

Probability = (Number of favorable outcomes) / (Total number of possible outcomes)

In this case, the number of favorable outcomes is the number of tickets Valera has studied, which is 50 - 7 = 43. The total number of possible outcomes is the total number of tickets, which is 50.

Plugging in the values, we get:

Probability = 43 / 50

Now let's calculate the probability.

Calculation:

Probability = 43 / 50 = 0.86

Therefore, the probability that Valera will get a ticket he has studied is 0.86.