Question

в коробке с ёлочными украшениями находится 90 одинаковых шаров ,отличающихся только цветом из них :15 шаров синих 15 красных ,30 серебрянных ,остальные золотые ,найдите вероятность того, что наудачу вынутый из коробки шар будет золотым.Ответ округлите до сотых(С РЕШЕНИЕМ ПОЖАЛУЙСТА!)

Answer 1

90-15-15-30 / 90 = 30/90 = 1/3  = 0,3

Answer 2

Problem Analysis

We are given a box containing 90 identical ornaments for a Christmas tree. The ornaments come in different colors: 15 blue, 15 red, 30 silver, and the rest are gold. We need to find the probability of randomly selecting a gold ornament from the box.

Solution

To find the probability, we need to determine the number of gold ornaments and the total number of ornaments in the box.

The number of gold ornaments can be calculated by subtracting the number of blue, red, and silver ornaments from the total number of ornaments: Number of gold ornaments = Total number of ornaments - Number of blue ornaments - Number of red ornaments - Number of silver ornaments

Let's calculate the number of gold ornaments first: Number of gold ornaments = 90 - 15 (blue) - 15 (red) - 30 (silver)

Now, let's calculate the total number of ornaments in the box: Total number of ornaments = Number of blue ornaments + Number of red ornaments + Number of silver ornaments + Number of gold ornaments

Finally, we can calculate the probability of randomly selecting a gold ornament: Probability = Number of gold ornaments / Total number of ornaments

Let's plug in the values and calculate the probability.

Calculation

Number of gold ornaments = 90 - 15 - 15 - 30 = 30 Total number of ornaments = 15 (blue) + 15 (red) + 30 (silver) + 30 (gold) = 90 Probability = 30 / 90 = 1/3 = 0.33 (rounded to the nearest hundredth)

Answer

The probability of randomly selecting a gold ornament from the box is approximately 0.33.