Question

Студент знает 25 вопросов из предложенных для экзамена 45 вопросов. Какова вероятность того, что студент ответит на один случайно заданный вопрос. Какова вероятность того, что студент ответит на два случайно заданных вопроса.

Answer 1

1) 45/25=1.8 - это вероятность того что он ответит на 1 случайно заданный вопрос.
2) 1.8/2= 0.9 - это вероятность того что он ответит на 2 случайно заданных вопроса.
точно или нет, не могу сказать

Answer 2

Probability of Answering One Randomly Selected Question

To calculate the probability of the student answering one randomly selected question, we need to divide the number of questions the student knows (25) by the total number of questions available for the exam (45).

The probability can be calculated as follows:

Probability = Number of Known Questions / Total Number of Questions

Probability = 25 / 45

Using this formula, the probability of the student answering one randomly selected question correctly is approximately 0.556 or 55.6%.

Probability of Answering Two Randomly Selected Questions

To calculate the probability of the student answering two randomly selected questions correctly, we need to consider the probability of answering the first question correctly and then the probability of answering the second question correctly.

Since the questions are selected randomly, the probability of answering each question correctly remains the same. Therefore, we can multiply the probability of answering one question correctly by itself to calculate the probability of answering two questions correctly.

Probability of Answering Two Questions = Probability of Answering One Question * Probability of Answering One Question

Probability of Answering Two Questions = (25 / 45) * (25 / 45)

Using this formula, the probability of the student answering two randomly selected questions correctly is approximately 0.309 or 30.9%.