展开全部

题目列表

题目内容
A certain band will perform 15 different songs in random order, and no song will be performed twice. If 9 of the songs are new, what is the probability that the first 2 songs that the band performs will both be new?

Give your answer as a fraction.
Of the 20 lightbulbs in a box, 2 are defective. An inspector will select 2 lightbulbs simultaneously and at random from the box. What is the probability that neither of the lightbulbs selected will be defective?
Give your answer as a fraction.
There are 10 pens in a box, and 2 of the pens are defective. If 2 pens are to be selected at random from the box without replacement, what is the probability that neither will be defective?
Give your answer as a fraction.
What is the probability that someone randomly selects a number from 100 to 159 inclusive such that the tens digit of the selected number is no more than 3 and the units digit of the selected number is no more than 4?
Give your answer as a fraction.
Two companies, $$C_1$$, and $$C_2$$, are participating in a fund-raising activity along with 8 other companies. Of the 10 companies, a group of 4 companies will be chosen to receive an award. Of all the possible choices of groups of 4 companies that will receive an award, how many choices include both companies $$C_1$$ and $$C_2$$?
From a group of 100 people including Alice and Bob, 40 people are to be randomly selected at the same time to win movie tickets. What is the probability that both Alice and Bob will be selected to win movie tickets?
Give your answer as a fraction.

Several 0 and 1 are arranged in a 10*10 palace as follows. Among all the number 0, what is the probability that they are arranged in both an odd row and an odd column?
Give your answer as a fraction.
In a bag, only red and blue balls (at least 2 balls for each color) are included.

Quantity A

The probability that red ball is selected when you add a blue ball to the box

Quantity B

The probability that red ball is selected when you remove a red ball to the box


Mark flips 2 dimes (10 cents each) and 1 nickel (5 cents) together for twice. What is the probability that the total value of coins on the heads is 15 cents?
Give your answer as a fraction.


The numbers 5, 8, 9, 9 and 9 are written on five different cards, as shown. If two of the cards are to be selected randomly, without replacement, what is the probability that the sum of the numbers on the two cards will be a multiple of 3?
Give your answer as a fraction.
p is the probability that event E will occur, and s is the probability that event E will not occur.

Quantity A

p+s

Quantity B

ps


A, B, and C are events in a probability experiment such that 0 < P(A) < 1, B and C are independent, and P(A) = 2P(B) = 3P(C).

Quantity A

$$\frac{2}{3}$$ P(A)

Quantity B

P(B or C)


In box H, there are 5 red balls, 3 green balls and 2 yellow balls, while In box R, there are 3 red balls and 7 yellow balls. If someone selects one ball from each box, what is the probability that he or she selects at least one yellow ball?
If one letter is to be randomly selected from the 7 letters in the word JOHNSON and one letter is to be randomly selected from the 5 letters in the word JONES, what is the probability that the two selections will be the same letter?
Give your answer as a fraction.
Set A: {71,73,79,83,87}
Set B: {57,59,61,67}
If one number is selected at random from set A, and one number is selected at random from set B, what is the probability that both numbers are prime?
20 boys and 40 girls are in Group A, while at least 7 boys, together with some girls are in Group B. To choose one person from each of the group, the probability that both are boys is no greater than $$\frac{1}{15}$$. Which of the following statements must be true?
Indicate all such statements.
A and B are independent events, and the probability that both events occur is $$\frac{1}{2}$$. Which of the following could be the probability that event A occurs?
Indicate all such probabilities.
Events A and B are independent. The probability that events A and B both occur is 0.6

Quantity A

The probability that event A occurs

Quantity B

0.3


A box contains 10 balls numbered from 1 to 10 inclusive. If Ann removes a ball at random and replaces it, and then Jane removes a ball at random, what is the probability that both women removed the same ball?
In a probability experiment, G and H are independent events. The probability that G will occur is r, and the probability that H will occur is s, where both r and s are greater than 0.

Quantity A

The probability that either G will occur or H will occur, but not both

Quantity B

r+s-r*s


共收录:

25000 +道题目

269本备考书籍

最新提问