Question

Tessa keeps seven cards with the picture of a king and three cards with the picture of a queen on a table face down, so the pictures are hidden. She mixes up the cards then turns over one card and finds the picture of a king on it. She removes this card from the table and turns over another card.

What is the probability that the card Tessa turns over has a picture of a king on it?

fraction 1 over 7
fraction 2 over 9
fraction 6 over 10
fraction 6 over 9

Answer 1

she starts off with 7 kings and 3 queens

then she takes one king away.

how many kings are left? how many total cards are left?

Answer 2

6

Answer 3

good, so how many total cards are left?

Answer 4

d?

Answer 5

good

Answer 6

A teacher wants to know whether the students in the entire school prefer watching television or playing outdoor games after school. The teacher draws a random sample from the following groups:

All school teachers
All students on the football team
All boys in each grade
All students in each grade

Which of the following groups best represents the population from which the teacher should take a random sample to get the best results for her survey?
All school teachers
All students on the football team
All boys in each grade
All students in each grade
@Vocaloid

Answer 7

any ideas?

Answer 8

d?

Answer 9

good

Answer 10

Jane has 38 marbles of the same shape and size in a box. The colors and amounts of the marbles are shown below:

14 white marbles
9 gray marbles
15 blue marbles

Without looking in the box, Jane takes out a marble at random. She then replaces the marble and takes out another marble from the box. What is the probability that Jane takes out a gray marble in both draws?
9 over 38 multiplied by 8 over 37 equal 72 over 1406
9 over 38 plus 8 over 37 equal 637 over 1406
9 over 38 plus 9 over 38 equal 684 over 1444
9 over 38 multiplied by 9 over 38 equal 81 over 1444

Answer 11

A?

Answer 12

find the probability of getting grey

Answer 13

im just checking these questions... A?

Answer 14

(since she replaces the marble, you just multiply

probability of grey*probability of grey) without subtracting anything

Answer 15

no

Answer 16

since she is replacing the marbles, it's just

probability of grey*probability of grey

Answer 17

D?

Answer 18

good

Answer 19

The dot plots below show the scores for a group of students who took two rounds of a quiz:

Two dot plots are shown one below the other. The title for the dot plot on the top is Round 1 and the title for the bottom plot is Round 2. Below the line for each dot plot is written Score. There are markings from 5 to 9 on the line at intervals of one. There is 1 dot above the mark 5, 4 dots above the mark 6, 2 dots above the mark 7, 2 dots above mark 8, and 1 dot above the mark 9. For the bottom dot plot there are 3 dots above the mark 5, 1 dot above the mark 6, and 6 dots above the mark 7.

Which of the following inferences can be made using the dot plot?

There is no overlap between the data.
Round 1 scores were lower than round 2 scores.
Round 2 scores were higher than round 1 scores.
The range of round 1 is greater than the round 2 range.

Answer 20

C?

Answer 21

great

Answer 22

Karin uses a probability simulator to pull colored pencils from a bag 60 times and to flip a coin 60 times. The results are shown in the tables below:


Color of Pencil Number of Times Pulled
Green 24
Red 19
Yellow 17


Heads Tails
25 35


Using Karin's simulation, what is the probability of pulling a red pencil and the coin landing on tails?
fraction 578 over 3,600
fraction 665 over 3,600
fraction 35 over 60
fraction 54 over 60

Answer 23

B?

Answer 24

great

Answer 25

The two dot plots below compare the forearm lengths of two groups of schoolchildren:

Two dot plots are shown one below the other. The title for the top dot plot is Forearm Length, Group A and the title for the bottom plot is Forearm Length, Group B. Below the line for each dot plot is written Length in inches. There are markings from 10 to 13 on each line at intervals of one. For the top line there are 4 dots above the first mark, 4 dots above the second mark, and 2 dots above the third mark. For the bottom line there are 2 dots above the second mark, 3 dots above the third mark, and 5 dots above the fourth mark.

Based on visual inspection of the dot plots, which group appears to have the longer average forearm length?

Group B, because five children have a forearm length longer than 12 inches.
Group B, because a child in the group has the least forearm length of 10 inches.
Group A, because no child in the group has a forearm length longer than 12 inches.
Group A, because four children in the group have the least forearm length of 10 inches.

Answer 26

A? @Vocaloid

Answer 27

great

Answer 28

There is an 80% chance of rain tomorrow and a 20% chance the football game will be postponed. What is the probability that it will rain tomorrow and the football game will be postponed?

4%
16%
20%
60%

Answer 29

c?

Answer 30

c?

Answer 31

@Vocaloid

Answer 32

helloo?? @Vocaloid

Answer 33

or is it 16%?

Answer 34

Milan uses a probability simulator to roll a six-sided number cube 100 times and to flip a coin 100 times. The results of the experiment are shown below:


Number on the Cube Number of Times Rolled
1 10
2 8
3 33
4 29
5 11
6 9


Heads Tails
29 71


Using Milan's simulation, what is the probability of rolling a 5 on the number cube and the coin landing on tails?
fraction 11 over 10,000
fraction 71 over 10,000
fraction 82 over 10,000
fraction 781 over 10,000

Answer 35

d?

Answer 36

@Vocaloid please answer me :(

Answer 37

yes

Answer 38

please be patient...

Answer 39

sorry

Answer 40

The dot plots below show the test scores of some mathematics students and some science students:

Two dot plots are shown one below the other. The top and the bottom plots have the title Mathematics Students and Science Students respectively. Below the line for each dot plot is written Mark. The markings on each line are from 30 to 50 at intervals of 1. For the top plot there are two dots each for 34 and 40 and 1 dot each for 32, 33, 35, 37, and 39. For the bottom plot there are 2 dots each for 43, 46 and 49 and 1 dot each for 41, 42, and 47.

Based on visual inspection of the dot plots, which group of students appears to have the larger average score?

The mathematics students
The science students
Both groups are similar.
Not enough information is available to draw a conclusion.

Answer 41

B?

Answer 42

@Vocaloid why are you taking so long to answer? :(

Answer 43

great

Answer 44

need to go

Answer 45

A researcher places a radio advertisement offering $32 in exchange for participation in a short study. The researcher accepts the first nine people who respond to the advertisement. Which of the following statements is true about the sample?

It is a valid sample because the first nine people were selected to participate.
It is not a valid sample because it is not a random sample of the population.
It is a valid sample because money was offered to participants.
It is not a valid sample because it is only a short study.
@Vocaloid

Answer 46

A?

Answer 47

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