Question

Прошу помогите решить. Из 1200 чистых кмпакт-дисков в среднем 72 непригодных для записи. Какова вероятность того, что случайно выбранный диск пригоден для записи????

Answer 1

Найдем количество пригодных:
n = 1200-72=1128
Тогда вероятность В = 1128/1200=0.94
Ответ: 0.94

Answer 2

Calculation of Probability

To calculate the probability of randomly selecting a usable disc from a collection of 1200 discs, we need to know the number of usable discs and the total number of discs.

Given that there are 72 discs that are not suitable for recording, the number of usable discs would be 1200 - 72 = 1128.

Therefore, the probability of randomly selecting a usable disc is calculated as:

Probability = Number of usable discs / Total number of discs

Probability = 1128 / 1200

Now, let's calculate the probability.