Question

На полке стоят одинаковые на вид бутылки с прозрачной жидкостью:4 бутылки с этиловым спиртом,6-с солевым раствором и 5-с перекисью водорода.Василий наугад берет с полки одну из бутылок.Найдите вероятность того,что выбранной бутылке окажется солевой раствор.ответ должен быть 0,4.нужно решение.

Answer 1

элементарная задача)

6+5+4=15

6/15=0.4 

Answer 2

Problem Analysis

In this problem, we are given a shelf with bottles containing different liquids: 4 bottles of ethyl alcohol, 6 bottles of salt solution, and 5 bottles of hydrogen peroxide. Vasily randomly selects one bottle from the shelf, and we need to find the probability that the selected bottle contains salt solution.

Solution

To find the probability, we need to determine the total number of bottles and the number of bottles containing salt solution.

The total number of bottles on the shelf is the sum of the bottles of ethyl alcohol, salt solution, and hydrogen peroxide:

Total number of bottles = 4 + 6 + 5 = 15

The number of bottles containing salt solution is given as 6.

Now, we can calculate the probability using the formula:

Probability = Number of favorable outcomes / Total number of possible outcomes

In this case, the favorable outcome is selecting a bottle containing salt solution, and the total number of possible outcomes is selecting any bottle from the shelf.

Therefore, the probability of selecting a bottle containing salt solution is:

Probability = Number of bottles containing salt solution / Total number of bottles

Probability = 6 / 15

Simplifying the fraction, we get:

Probability = 2 / 5

So, the probability of selecting a bottle containing salt solution is 2/5, which is equal to 0.4.

Answer

The probability that the selected bottle will contain salt solution is 0.4.