5272道题目5525 条题源记录 · 相同内容已合并
概率与条件概率进阶
For a particular machine that produces beads, 29 out of every 100 beads it produces have a defect. A bead produced by the machine will be selected at random. What is the probability of selecting a bead that has a defect?
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概率与条件概率基础
A total of 50 children attended a summer camp and were offered 4 types of sandwiches. The table shows the number of children who chose each type of sandwich.

If one of these children is selected at random, what is the probability of selecting a child who chose a vegetarian sandwich?
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概率与条件概率挑战
Set K consists of all the positive integers that are less than or equal to 160, where none of the integers are repeated. If a number is selected at random from set K, what is the probability of selecting a number that is even and less than or equal to 50?
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概率与条件概率进阶
The table summarizes the distribution of color and shape for 100 tiles of equal area.
| Red | Blue | Yellow | Total | |
| Square | 10 | 20 | 25 | 55 |
| Pentagon | 20 | 10 | 15 | 45 |
| Total | 30 | 30 | 40 | 100 |
If one of these tiles is selected at random, what is the probability of selecting a red tile? (Express your answer as a decimal or fraction, not as a percent.)
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概率与条件概率基础
Each face of a fair 14-sided die is labeled with a number from 1 through 14, with a different number appearing on each face. If the die is rolled one time, what is the probability of rolling a 2?
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概率与条件概率基础
On a street with 7 houses, 2 houses are blue. If a house from this street is selected at random, what is the probability of selecting a house that is blue?
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概率与条件概率挑战
A grove has 6 rows of birch trees and 5 rows of maple trees. Each row of birch trees has 8 trees 20 feet or taller and 6 trees shorter than 20 feet. Each row of maple trees has 9 trees 20 feet or taller and 7 trees shorter than 20 feet. A tree from one of these rows will be selected at random. What is the probability of selecting a maple tree, given that the tree is 20 feet or taller?
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概率与条件概率基础
At a movie theater, there are a total of 350 customers. Each customer is located in either theater A, theater B, or theater C. If one of these customers is selected at random, the probability of selecting a customer who is located in theater A is 0.48, and the probability of selecting a customer who is located in theater B is 0.24. How many customers are located in theater C?
原库参考解析
概率与条件概率基础
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A data set of three numbers is shown. If a number from this data set is selected at random, what is the probability of selecting a positive number?
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概率与条件概率基础

The table summarizes members of a local organization by age and whether they live east or west of the river. If a member of the organization is selected at random, what is the probability that the selected member is at least 40 years old?
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概率与条件概率进阶
The table gives the distribution of votes for a new school mascot and grade level for 80 students.

If one of these students is selected at random, what is the probability of selecting a student whose vote for new mascot was for a lion?
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概率与条件概率挑战

The same 20 contestants, on each of 3 days, answered 5 questions in order to win a prize. Each contestant received 1 point for each correct answer. The number of contestants receiving a given score on each day is shown in the table above.
No contestant received the same score on two different days. If a contestant is selected at random, what is the probability that the selected contestant received a score of 5 on Day 2 or Day 3, given that the contestant received a score of 5 on one of the three days?
原库参考解析
