# A bag has 5 red marbles, 6 blue marbles and 4 black marbles. What is the probability of picking a red marble, replacing it, and then picking another red marble?

QUESTION POSTED AT 18/01/2020 - 07:24 AM

QUESTION POSTED AT 18/01/2020 - 07:24 AM

Working;

The probability of picking a red is

The probability remains the same for the second picking since there is replacement;

A red followed by a red is;

The actual probability of getting one of the three things he wants is 3/total number of sectios.

He thought it as since he needs to get 1 out of three items, so he did 1/3.

To get the correct answer, the number of items needed is divided with the total number of sections.

He thought it as since he needs to get 1 out of three items, so he did 1/3.

To get the correct answer, the number of items needed is divided with the total number of sections.

ANSWERED AT 19/02/2020 - 03:49 PM

QUESTION POSTED AT 19/02/2020 - 03:49 PM

Probability when picking one is just number of "correct" anwsers devided by the total picking from

2 are green, 5 are blue, so 7 marbles are correct

the chance of picking one correct equals 7/10

2 are green, 5 are blue, so 7 marbles are correct

the chance of picking one correct equals 7/10

ANSWERED AT 19/02/2020 - 03:37 PM

QUESTION POSTED AT 19/02/2020 - 03:37 PM

**Answer:**

24 pints of blue paint used to create 40 pints of purple paint .

**Step-by-step explanation:**

As given

Hugo is mixing blue paint with red paint to create purple paint.

The ratio of blue to red is 3 to 2.

Let us assume that the x be scalar mutiple .

Thus

Pints of blue paint used = 3x

Pints of red paint used = 2x

As given 40 pints purple paints is made by mixing blue paint with red paint .

Than the equation becomes

2x + 3x = 40

5x = 40

x = 8

Thus

Pints of blue paint used = 3 × 8

= 24 pints

Therefore 24 pints of blue paint used to create 40 pints of purple paint .

ANSWERED AT 19/02/2020 - 01:02 AM

QUESTION POSTED AT 19/02/2020 - 01:02 AM

The answer is C (0,-3)

ANSWERED AT 19/02/2020 - 01:01 AM

QUESTION POSTED AT 19/02/2020 - 01:01 AM

The sample space for this event is {H1,H2,H3,H4,H5,H6,T1,T2,T3,T4,T5,T6}

There are 12 possibilities.

The probability that we get a T1 or T2 is 2/12 or 1/6.

There are 12 possibilities.

The probability that we get a T1 or T2 is 2/12 or 1/6.

ANSWERED AT 19/02/2020 - 01:01 AM

QUESTION POSTED AT 19/02/2020 - 01:01 AM

15/12 simplified would be A) 3:4

ANSWERED AT 19/02/2020 - 12:55 AM

QUESTION POSTED AT 19/02/2020 - 12:55 AM

The answer is C I think

ANSWERED AT 19/02/2020 - 12:53 AM

QUESTION POSTED AT 19/02/2020 - 12:53 AM

**Answer:**

**Carlotta needs 24 orange beads for her necklace.**

**Step-by-step explanation:**

For each necklace, the ratio of blue beads to orange beads is 3 to 2. or 3:2

Total beads given to make a necklace is = 60

Let the number of orange beads be = x

The ratio is 2 orange beads out of 5 total beads

So, we can represent the ratio as:

x=24

**Hence, Carlotta needs 24 orange beads for her necklace.**

Blue beads needed =

**We can also check the ratio for blue beads to orange beads:**

Divide by 4, we get

Divide by 3, we get

...... (the given ratio)

**Therefore, Carlotta needs 24 orange beads for her necklace.**

ANSWERED AT 19/02/2020 - 12:52 AM

QUESTION POSTED AT 19/02/2020 - 12:52 AM

For the answer u need to :

$15.86 divided by $1.25 = 12.69

That is he can buy 12 marbles.

Hope this helps :)

$15.86 divided by $1.25 = 12.69

That is he can buy 12 marbles.

Hope this helps :)

ANSWERED AT 19/02/2020 - 12:40 AM

QUESTION POSTED AT 19/02/2020 - 12:40 AM

30/90 break that down to the smallest possible number we use 30 making it 1/3.

ANSWERED AT 19/02/2020 - 12:16 AM

QUESTION POSTED AT 19/02/2020 - 12:16 AM

The answer is 12 ÷ 4 + 13 > 2 + 22 ÷ 2

ANSWERED AT 18/02/2020 - 11:43 PM

QUESTION POSTED AT 18/02/2020 - 11:43 PM

The probability that you can get N heads in a row would be:

Let p be the probability of flipping a heads. Let x be number of flips needed to achieve h consecutive heads. The solution is E(x) = (1−p^h) / (p^h(1−p))

This expression may be derived as follows. The probability of being successful immediately is p^r. However, one might get a tails immediately. In that case, the number of flips needed is 1+E(x) (one flip has been used and we are back to the original position). We might get a heads and then a tails. In this case two flips have been used and we are back to the original position. Continue this up to h−1 heads followed by a tails in which case h flips have been used and we are back to the original position.

ANSWERED AT 18/02/2020 - 11:40 PM

QUESTION POSTED AT 18/02/2020 - 11:40 PM

59+68+12+1=139=Total # of birds or 100%

Blue Jays have been seen 59 times. That's 59 out of 140 or 59/140. 59/140 = 0.4214

Rounded to the nearest thousandth, 0.4214 is 0.421.

Your answer is A.

Blue Jays have been seen 59 times. That's 59 out of 140 or 59/140. 59/140 = 0.4214

Rounded to the nearest thousandth, 0.4214 is 0.421.

Your answer is A.

ANSWERED AT 18/02/2020 - 11:38 PM

QUESTION POSTED AT 18/02/2020 - 11:38 PM

15:6 when reduced = 5:2

ANSWERED AT 18/02/2020 - 11:36 PM

QUESTION POSTED AT 18/02/2020 - 11:36 PM

This ratio would be 24:32!

Hope it helps!

Hope it helps!

ANSWERED AT 18/02/2020 - 02:54 PM

QUESTION POSTED AT 18/02/2020 - 02:54 PM

28/112 = 1/x

cross multiply

28x =112

x = 112/28

x = 4 cookies for each student.

cross multiply

28x =112

x = 112/28

x = 4 cookies for each student.

ANSWERED AT 18/02/2020 - 02:47 PM

QUESTION POSTED AT 18/02/2020 - 02:47 PM

P(winning all 4) = (1/10)^4 = 1/10,000

ANSWERED AT 18/02/2020 - 02:27 PM

QUESTION POSTED AT 18/02/2020 - 02:27 PM

P(total of 3) = 2C1 * (0.5) * (0.5) = 2 * 0.25 = 0.5 = 1/2

ANSWERED AT 18/02/2020 - 02:25 PM

QUESTION POSTED AT 18/02/2020 - 02:25 PM

The relative frequency of students with green eyes is 63/303 = 0.21

ANSWERED AT 18/02/2020 - 02:18 PM

QUESTION POSTED AT 18/02/2020 - 02:18 PM

The mean time it takes to walk to the bus stop is 8 minutes (with a standard deviation of 2 minutes) and the mean time it takes for the bus to get to school is 20 minutes (with a standard deviation of 4 minutes). The distributions are normal. a. How long will it take (in minutes), on average, to get to school? b. What is the standard deviation of the trip to school? c. What is the probability that it will take longer than 30 minutes to get to school? Due to a miscalculation, you realize it actually takes an average of 10 minutes to walk to the bus stop. d. How long will it take (in minutes), on average, to get to school? e. What is the standard deviation of the trip to school? f. What is the probability that it will take longer than 30 minutes to get to school? The only ones I need help with is C and F. I have the answer for the rest of them. Can someone please help me with parts C and F??

ANSWERED AT 18/02/2020 - 01:56 PM

QUESTION POSTED AT 18/02/2020 - 01:56 PM

The probability that one of the three horses finishes first is 3/11. If one of the three horses has finished first, then the probability that one of the remaining two horses finishes second is 2/10. If two of the three horses have finished first and second, then the probability of the remaining horse from the three finishing third is 1/9. Therefore the required probability is given by:

3 x 2 x 1/11x 10 x 9= you can calculate

3 x 2 x 1/11x 10 x 9= you can calculate

ANSWERED AT 18/02/2020 - 01:53 PM

QUESTION POSTED AT 18/02/2020 - 01:53 PM

**D. 1**

Hope I helped! Got 100% on my quiz, hope you do too!

ANSWERED AT 18/02/2020 - 01:53 PM

QUESTION POSTED AT 18/02/2020 - 01:53 PM

Well here im going to give you the process so that you can figure it out: The probability that Jonas will get an orange is 5/13.We know this because if Jonas gets an orange there are now 12 pieces of fruit remaining. Therefore the probability that Beth will get an apple is 5/12. What you need to do is to multiply these two values of probability to find the required probability. Hope this has helped

ANSWERED AT 18/02/2020 - 01:48 PM

QUESTION POSTED AT 18/02/2020 - 01:48 PM

Multiply the percentage by the number: 300•.60=180. 180 cars are blue :)

ANSWERED AT 18/02/2020 - 12:36 PM

QUESTION POSTED AT 18/02/2020 - 12:36 PM

The area of the blue tiles is the area of the entire design minus the area of the green tiles, or B = A - G

For the next question,

A = 49 in^2

G = 15 in^2

B = 49 - 15

B = 34 in^2

For the next question,

A = 49 in^2

G = 15 in^2

B = 49 - 15

B = 34 in^2

ANSWERED AT 18/02/2020 - 11:46 AM

QUESTION POSTED AT 18/02/2020 - 11:46 AM

You have 7 blue tickets and 21 total.

So the odds of pulling a blue ticket is 7

21

If you replace the ticket, the total number of tickets changes, so the total is 20 tickets.

The odds of pulling a purple ticket is 10

20

So the odds that you pull a blue, replace it, then pull a purple is:

7 * 10 = 70 =**1**

21 20 420**6**

so your answer is **1/6 or D**

So the odds of pulling a blue ticket is 7

21

If you replace the ticket, the total number of tickets changes, so the total is 20 tickets.

The odds of pulling a purple ticket is 10

20

So the odds that you pull a blue, replace it, then pull a purple is:

7 * 10 = 70 =

21 20 420

ANSWERED AT 18/02/2020 - 11:44 AM

QUESTION POSTED AT 18/02/2020 - 11:44 AM

__Answer__

C: 0.0065%

__Explanation__

Probability is the chance of an event happening. It is given by the formula below;

Probability = (number of favorable outcome) / (number of total outcome)

The question given does not require any calculations since the probabilities are of varies events is given in the table.

The probability that any given car will have a brake failure if it is make A is **0.0065%.**

ANSWERED AT 18/02/2020 - 11:21 AM

QUESTION POSTED AT 18/02/2020 - 11:21 AM

If tossing 1 head is 1/2, then you have to do 1/2^4 which is 1/2 × 1/2 × 1/2 × 1/2 (I imagine it as a tree diagram if that helps). 2^4 is 16, so your answer is b) 1/16. Hope this helps!

ANSWERED AT 18/02/2020 - 11:21 AM

QUESTION POSTED AT 18/02/2020 - 11:21 AM

4 + 2 + 3 = 9 total marbles

There are 2 red

9 - 2 = 7

There is a 7/9 probability the first roll is not red.

I am confused what you mean by "picking two marbles without replacing the first." Please elaborate so I can answer the second part.

There are 2 red

9 - 2 = 7

There is a 7/9 probability the first roll is not red.

I am confused what you mean by "picking two marbles without replacing the first." Please elaborate so I can answer the second part.

ANSWERED AT 18/02/2020 - 10:49 AM

QUESTION POSTED AT 18/02/2020 - 10:49 AM

I think the answer is 1:0

ANSWERED AT 18/02/2020 - 10:25 AM

QUESTION POSTED AT 18/02/2020 - 10:25 AM