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

Answered by admin AT 18/01/2020 - 07:24 AM

 \frac{1}{9}

Working;
The probability of picking a red is  \frac{5}{15}

The probability remains the same for the second picking since there is replacement;
A red followed by a red is;
 \frac{5}{15} * \frac{5}{15} = \frac{1}{9}
Post your answer

Related questions

You have a bag of 10 marbles. three of them are red, five are blue, and two are green. what is the probability of randomly picking a green or blue marble out of the bag?

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

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


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

Hugo is mixing blue paint with red paint to create purple paint. The ratio of blue to red is 3 to 2. How many pints of blue paint will he use to create 40 pints of purple paint?

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 = \frac{40}{5}

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

Which ordered pair describes the location of the red point?

The answer is C (0,-3)


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


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

A coin is tossed and a number cube a rolled. What is the probablity that the coin shows tails and the die shows a 1 or a 2 ?

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.

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


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

Carlotta is making blue and orange necklaces in several lengths. For each necklace, her ratio of blue beads to orange beads is 3 to 2. How many orange beads will Carlotta need for a necklace of 60 beads?

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:

\frac{2}{5}=\frac{x}{60}

5x=120

x=24

Hence, Carlotta needs 24 orange beads for her necklace.

Blue beads needed = 60-24=36

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

\frac{36}{24}

Divide by 4, we get

\frac{9}{6}

Divide by 3, we get

\frac{3}{2}  ...... (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

Tom has $15.86 to buy marbles that cost $1.25 each. he wants to know how many marbles he can buy. what should he do after he divides.

For the answer u need to :
$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

Replace ? with =, >, or < to make the statement true. 12 ÷ 4 + 13 ? 2 + 22 ÷ 2 A. = B. > C. <

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

A fair coin is tossed repeatedly. What is the probability that three heads in a row will occur before a tail followed by two heads?

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 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

Each morning, Lola notes the birds feeding on her bird feeder. So far this month, she has seen 59 blue jays, 68 black crows, 12 ed robins, and 1 cardinal. What is the probability of a blue jay being the next bird Lola sees? A) 0.421 B) 0.042 C) 0.59 D) 0.059

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.

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


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

Miss rivera picked 112 cookies your 28 students in her class if she passes out on her cookies how many cookies will each student receive

28/112 = 1/x

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

The Law of Large Numbers: I need help on finding the probability of this situation.

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

A horse race has 11 entries and one person owns 3 of those horses. Assuming that there are no ties, what is the probability that those three horses finish first, second, and third

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

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


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

A basket contains 13 pieces of fruit: 5 apples, 5 oranges, and 3 bananas. Jonas takes piece of fruit at random from the basket, and then Beth takes a piece at random. What is the probability that jonas will get an orange and Beth will get an apple?

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

In the mall parking lot 60% of the cars are blue if there are 300 cars how many are blue

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

How can I express the area of the blue tiles?

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

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


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

A raffle jar contains 10 purple tickets, 7 blue tickets, and 4 red tickets. What is the probability of randomly selecting a blue ticket, and without replacing it, then randomly selecting a purple ticket? A.2/21 B.1/10 C.1 /7 D. 1/6

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

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


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

The probability that a new car of a particular make will have a brake failure is given in the table. What is the probability that any given car will have a brake failure if it is make A? A: 0.0048% B: 0.0037% C: 0.0065% D: 0.0108% E: insufficient data

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

What is the probability of tossing 4 heads? a) 1/2 b) 1/16 c) 1/33 d) 1/4

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

Find the probability if you pick two marbles without replacing the first. so we have 4 Green, 2 red and three yellow. What is the probability that the first roll is not red and what is the probability that the second roll is not red

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.

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


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