Question

В лыжных гонках участвуют 13 спортсменов из России, 2 спортсмена изНорвегии и 5 спортсменов из Швеции. Порядок, в котором спортсменыстартуют, определяется жребием. Найдите вероятность того, что первымбудет стартовать спортсмен из России.

Answer 1

Найдем общее кол-во спортсменов 13+2+5=20
13/20=0,65
Ответ: 0,65 или 65%  

Answer 2

Probability of a Russian athlete starting first in a ski race

To find the probability of a Russian athlete starting first in a ski race, we need to consider the total number of athletes and the number of Russian athletes participating.

According to the information provided, there are 13 athletes from Russia, 2 athletes from Norway, and 5 athletes from Sweden participating in the race. The order in which the athletes start is determined by drawing lots or by a random selection process.

To calculate the probability of a Russian athlete starting first, we need to divide the number of Russian athletes by the total number of athletes:

Probability = Number of Russian athletes / Total number of athletes

In this case, the number of Russian athletes is 13, and the total number of athletes is 13 (from Russia) + 2 (from Norway) + 5 (from Sweden) = 20.

Therefore, the probability of a Russian athlete starting first is:

Probability = 13 / 20 = 0.65

So, the probability of a Russian athlete starting first in the ski race is 0.65 or 65%.