Question

Вероятность того, что новая шариковая ручка пишет плохо (или не пишет), равна 0,09. Покупатель в магазине выбирает одну такую ручку. Найдите вероятность того, что эта ручка пишет хорошо.

Answer 1

1 - 0.09 = 0.91 - шанс, что ручка пишет хорошо

Answer 2

Probability that the new ballpoint pen writes poorly

The given problem states that the probability of a new ballpoint pen writing poorly (or not writing at all) is 0.09. We need to find the probability that this pen writes well.

Let's denote the event of the pen writing well as A and the event of the pen writing poorly as B. We are given that P(B) = 0.09. We need to find P(A).

To find P(A), we can use the complement rule, which states that the probability of an event A occurring is equal to 1 minus the probability of the event not occurring (in this case, the event of the pen writing poorly).

Therefore, we have:

P(A) = 1 - P(B)

Substituting the given value of P(B) = 0.09, we can calculate P(A):

P(A) = 1 - 0.09 = 0.91

Therefore, the probability that the new ballpoint pen writes well is 0.91.