help!

- anonymous

help!

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- anonymous

The number of chips of different colors in Fran's bag is shown below:
9 red chips
4 green chips
15 yellow chips
Fran takes out a chip from the bag randomly without looking. He replaces the chip and then takes out another chip from the bag. What is the probability that Fran takes out a green chip in both draws?
4 over 28 multiplied by 4 over 28 equal to 16 over 784
4 over 28 plus 4 over 28 equal to 8 over 56
4 over 28 multiplied by 3 over 27 equal to 12 over 756
4 over 28 plus 3 over 27 equal to 192 over 756

- anonymous

@Vocaloid

- Vocaloid

number of green chips/number of total chips = ?

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## More answers

- anonymous

i dont get it

- Vocaloid

number of green chips = ?

- anonymous

4

- Vocaloid

total number of chips = ?

- anonymous

4

- Vocaloid

read the problem again....
how many chips are there in total?

- Vocaloid

add all the colors together...

- anonymous

oh, 28

- Vocaloid

right, so number of green chips/number of total chips = ?

- anonymous

4/28

- Vocaloid

right. since he picks out two chips (with replacement) we multiply:
(4/28)*(4/28) = ?

- anonymous

0.02040816326

- Vocaloid

as a fraction, please...

- anonymous

ok

- anonymous

1/49

- Vocaloid

don't reduce the fraction
4*4 = ?

- anonymous

16

- Vocaloid

right, and 28*28 = ?

- anonymous

784

- Vocaloid

right, so (4/28)*(4/28) = 16/784, so our answer is...?

- anonymous

A!

- Vocaloid

right

- anonymous

ok next

- anonymous

Amelia rolls two fair number cubes numbered from 1 to 6. She first defines the sample space as shown below:
(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6)
(2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6)
(3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (3, 6)
(4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6)
(5, 1), (5, 2), (5, 3), (5, 4), (5, 5), (5, 6)
(6, 1), (6, 2), (6, 3), (6, 4), (6, 5), (6, 6)
Based on the sample space, what is the probability of getting a total of 4?
6 over 36
5 over 36
4 over 36
3 over 36

- Vocaloid

look at each of the ordered pairs, and count how many add up to 4

- anonymous

what do u mean?

- Vocaloid

ok, the first pair is (1,1), and 1+1 = 2, right?
this doesn't add up to 4, so we ignore it and go to the next one, (1,2)...

- anonymous

ok

- Vocaloid

keep following the pattern and see how many pairs add up to 4

- anonymous

(1,3) = 4

- Vocaloid

right, keep going...

- anonymous

(2,2) and (3,1)

- Vocaloid

right, so we have 3 pairs out of 36, so our answer is 3/36

- anonymous

oh okay! next!

- Vocaloid

how many are there??

- anonymous

like 10

- anonymous

but they are quick ones :)

- anonymous

There are 5 cards with a picture of a rose and 3 cards with a picture of a daisy. Alia keeps all the cards down on a table with the pictures hidden and mixes them up. She then turns over one card and finds the picture of a rose on it. She removes this card from the table and turns over another card without looking. What is the probability that the card that Alia turns over has a rose on it?
4 over 7
5 over 8
5 over 7
4 over 5

- Vocaloid

how many roses does she begin with?

- anonymous

um, 1

- Vocaloid

read the problem again... how many roses are there at the beginning?

- anonymous

5

- Vocaloid

ok, after one gets taken away, how many are left?

- anonymous

3

- Vocaloid

no, please try again...
there are 5 to begin with, one gets taken away, how many are left?

- anonymous

4

- Vocaloid

right...
now, let's read the problem again. how many total cards are there at the begining?

- anonymous

5

- Vocaloid

total cards = roses + daisies = ?

- anonymous

8

- Vocaloid

right, so we start with 8, then we take one away, how many are left?

- anonymous

7

- Vocaloid

right, so our probability of getting a rose again is 4/7

- anonymous

ok so A?

- Vocaloid

yes

- anonymous

ok next!

- anonymous

Kate is playing a game at the school carnival. There is a box of marbles, and each box has a white, a green, a blue, and an orange marble. There is also a fair 2-sided coin. How many outcomes are in the sample space for pulling a marble out of the box and tossing the coin?
16
8
6
12

- Vocaloid

(number of colors)*(number of sides on a coin) = ?

- anonymous

what are the number of colors and number of sides on a coin

- Vocaloid

read the problem...

- anonymous

um 4 colors and 2 coins?

- Vocaloid

right, so (number of colors)*(number of sides on a coin) = ?

- anonymous

8

- Vocaloid

right.

- anonymous

ok next!

- anonymous

The table below shows the number of shirts of different colors in a closet:
Color of Shirt Number
Red 1
Blue 6
Green 1
Pink 4
A coin
Dennis selects a shirt from the closet randomly without looking. What is the probability that Dennis will select a pink shirt and the coin will land tails up?
5 over 6
3 over 6
4 over 24
2 over 24

- Vocaloid

(number of pink shirts)/(total number of shirts) = ?

- anonymous

48

- Vocaloid

/ means divide...

- Vocaloid

(4/12)*(1/2) = ?

- anonymous

1/3

- Vocaloid

let's leave it as 4/12 for now
(4/12)*(1/2) = ?

- anonymous

1/6

- Vocaloid

let's not simplify the fractions, ok?
4*1 = ?

- anonymous

4

- Vocaloid

and 12*2 = ?

- anonymous

24

- Vocaloid

right, so (4/12)*(1/2) = 4/24

- anonymous

ok
Amy makes the following statement:
"There is a 60% chance of snow tomorrow and a 10% chance I will be late for school."
What is the probability that it will snow and Amy will be late for school?
3%
6%
50%
70%

- Vocaloid

multiply the two probabilities together

- Vocaloid

(0.6)*(0.1) = ?

- anonymous

0.7

- Vocaloid

* means multiply...

- Vocaloid

(0.6)*(0.1) = ?

- anonymous

0.6

- Vocaloid

no, please try again...
what is 0.6 times 0.1? use a calculator if you are not sure...

- anonymous

0.06

- Vocaloid

right, now convert that to a percentage by multiplying by 100
0.06*100 = ?

- anonymous

6

- Vocaloid

right, so our final answer is 6%

- anonymous

ok next!
The table below shows the number of marbles of different colors in a bag:
Color of Marbles Number of Marbles
Pink 5
Blue 2
Green 3
Ursula draws a marble from the bag randomly without looking. She then draws another marble from the bag without replacing the first one. Which expression shows the probability of drawing green marbles in both the trials?
3 over 10 multiplied by 2 over 9
3 over 10 multiplied by 2 over 10
3 over 10 added to 2 over 9
3 over 10 added to 2 over 10

- Vocaloid

(number of green marbles) / (number of total marbles) = ?

- anonymous

3/10

- Vocaloid

right... that's the first marble.
now, we started with 3 green ones, how many are left after we take one away?

- anonymous

2

- Vocaloid

right. now, we started off with 10 total marbles, how many are left after we take one away?

- anonymous

9

- Vocaloid

so our final answer is (3/10)*(2/9)...

- anonymous

6/90

- Vocaloid

read the answer choices...

- anonymous

oh ok! next!
Joy is giving ice cream cones to some children at a carnival. She has 8 chocolate ice cream cones, 10 vanilla ice cream cones, and 6 strawberry ice cream cones. If Joy selects an ice cream cone randomly without looking, what is the probability that she will give a chocolate ice cream cone to the first child and then a vanilla ice cream cone to the second child?
8 over 24 plus 10 over 24 is equal to 18 over 24
8 over 24 plus 10 over 23 is equal to 424 over 552
8 over 24 multiplied by 10 over 23 is equal to 80 over 552
8 over 24 multiplied by 10 over 24 is equal to 80 over 576

- Vocaloid

this is almost the same problem as the last one, just with different numbers... can you try this one yourself?

- anonymous

no, i need you to help me :)

- Vocaloid

read over the other problem again and try this one yourself...

- Vocaloid

it's literally the same thing all over again

- anonymous

:(

- Vocaloid

(number of chocolates)/(total) = ?

- anonymous

8/24

- Vocaloid

right, and (vanillas)/(total - 1) = ?

- anonymous

10/23

- Vocaloid

right, so multiply them together like we've always done

- anonymous

80/552

- anonymous

next! Winnie used a probability simulator to roll a 6-sided number cube and flip a coin 100 times. The results are shown in the tables below:
Number on the Cube Number of Times Rolled
1 18
2 25
3 12
4 28
5 7
6 10
Heads Tails
44 56
Using Winnie's simulation, what is the probability of rolling a 4 on the number cube and the coin landing heads up?
16 over 100
72 over 100
1232 over 10000
2432 over 10000

- Vocaloid

alright, probability of rolling 4 = ?

- anonymous

28

- Vocaloid

probability of rolling 4 = (number of 4's)/(total) = ?

- anonymous

how do i get that answer?

- Vocaloid

how many total times was the number cube rolled?

- anonymous

100

- Vocaloid

and how many times was 4 rolled?

- anonymous

1

- Vocaloid

read the problem again...

- Vocaloid

how many times was 4 rolled?

- anonymous

28

- Vocaloid

right, so probability of rolling 4 = (number of 4's)/(total) = ?

- anonymous

28/100

- Vocaloid

right, now do the same thing with the coin...

- Vocaloid

probability of heads = (number of heads)/(total) = ?

- anonymous

how do i do that one

- Vocaloid

read the problem again............

- Vocaloid

(number of heads)/(total number of coin flips) =

- anonymous

44/100

- Vocaloid

right, now multiply like we did before

- anonymous

i got c! next!

- anonymous

Simon used a probability simulator to pull 3 colored marbles from a bag and flip a coin 50 times. The results are shown in the tables below:
Color of Marble Number of Times Rolled
Blue 15
Green 19
Yellow 16
Heads Tails
26 24
Using Simon's simulation, what is the probability of pulling a blue marble and the coin landing tails up?
39 over 50
250 over 50
120 over 2500
360 over 2500

- Vocaloid

probability of blue marble = ?

- anonymous

15

- Vocaloid

probability of blue marble = (number of blue marbles)/(total) = ?

- anonymous

15/50

- Vocaloid

probability of tails = ?

- anonymous

24

- Vocaloid

no, do the same thing we did before...,....

- anonymous

i got D

- Vocaloid

probability of tails = (tails)/(total) = ?

- anonymous

next!

- anonymous

Sue used a probability simulator to roll a 12-sided number cube 100 times. Her results are shown in the table below:
Number on the Cube Number of Times Rolled
1 14
2 12
3 10
4 5
5 16
6 5
7 8
8 18
9 2
10 5
11 2
12 3
Using Sue's simulation, what is the frequency of rolling a 2 on the number cube?
100 over 88
12 over 100
100 over 12
88 over 100

- Vocaloid

probability of 2 = ?

- anonymous

12

- Vocaloid

you keep forgetting the /(total) part

- Vocaloid

(number of 2's)/(total) = ?

- anonymous

i got 12/100

- Vocaloid

right

- anonymous

is that the answer?

- Vocaloid

yes....

- anonymous

At a conference for 250 people, 40% of the participants are French, 45% are Americans, 10% are Germans, and the rest are of other nationalities. How many French participants are at the conference?
150
130
120
100

- Vocaloid

(.40)*(number of people) = ?

- anonymous

100

- Vocaloid

right.

- anonymous

ok thanks

- Vocaloid

medal please?

- anonymous

ofcourse

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