Question

В соревнованиях по метанию копья принимает участие 7 спортсменов из России , 5 из Германии , 4 из Польши и 9из Австралии . Порядок выступления определяется жребием . Найдите вероятность того , что спортсмен , выступающий первым , будет представлять Россию .

Answer 1

Вероятность события А равна кол-во благоприятных исходов, на кол-во всех исходов, т.е:
А=7\7+5+4+9= 7/25
Ответ: Вероятность равна 7\25 ≈ 0, 28
Вот и  все

Answer 2

Probability of a Russian athlete performing first

To find the probability that a Russian athlete performs first in the javelin throwing competition, we need to calculate the ratio of the number of Russian athletes to the total number of athletes.

Given the following information: - Number of Russian athletes: 7 - Number of German athletes: 5 - Number of Polish athletes: 4 - Number of Australian athletes: 9

The total number of athletes participating in the competition is 7 + 5 + 4 + 9 = 25.

Therefore, the probability that a Russian athlete performs first can be calculated as follows:

Probability = Number of Russian athletes / Total number of athletes = 7 / 25 = 0.28

So, the probability that the athlete performing first represents Russia is 0.28 or 28%.

Please note that the order of performance is determined by drawing lots, so this calculation assumes that the drawing is fair and unbiased.