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Sergeu [11.5K]
3 years ago
13

A bowl contains 8 blue marbles and 5 green marbles. Elizabeth randomly draws 4 marbles from the bowl. She does not replace the m

arbles after each draw. What is the probability that she draws 1 blue marble and 3 green marbles?
A.
B.
C.
D.
Mathematics
2 answers:
Mrrafil [7]3 years ago
6 0
Probability ( 1 blue marble and 3 green marbles) = ( Blue, green, green, green) + ( green, blue, green, green) + ( green, green, blue, green) + ( green, green, green, blue) = { (8/13) × (5/12) × (4/11) × (3/10) } + { (5/13) × (8/12) × (4/11) × (3/10) } + { (5/13) × (4/12) × (8/11) × (3/10) } + { (5/13) × (4/12) × (3/11) × (8/10) } = (4/143) + (4/143) + (4/143)+ (4/143) = 16/143 If the answer does not correspond to yours, do tell me. I'll try to correct mine
ElenaW [278]3 years ago
6 0
P (1 blue, 3 green) = \frac{C (8, 1)*C(5, 3)}{C(13, 4)} =  \frac{80}{715}= \frac{16}{143} }
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Serggg [28]
Well first to find the mean you will have to add up all the numbers together.
5,299 is the total. After you have done that count how many numbers there are. There are 24 numbers. Divide 5,299 by 24 and you get about 220.8. So the mean is 220.8 To find the median number of jumps, write out all the numbers in order from least to greatest. I think you can do this part! The middle number is your answer. If there is no middle number, get the two numbers that are on each side of the middle and divide by 2. Hope I helped!
4 0
3 years ago
Read 2 more answers
Students are making ornaments and each takes 1 2 of a piece of Bristol board. They go to the cupboard and find 1 1 2 pieces of B
s2008m [1.1K]

Answer: 3

Step-by-step explanation:

Feom the question, we are informed that students are making ornaments and each takes 1/2 of a piece of Bristol board and that they go to the cupboard and find 1 1/2 pieces of Bristol board.

The number of ornaments that they can make will be calculated by dividing 1 1/2 by 1/2. This will be:

= 1 1/2 ÷ 1/2

= 3/2 ÷ 1/2

= 3/2 × 2/1

= 3

They can make 3 ornaments

8 0
3 years ago
Tim has some video games. Mark has twice as
BabaBlast [244]

7 or more games

2x = 20+

so if he had 7 games, mark would have double (14 games)z 14+7=21. that's more that 20 games.

*Aggressively drops microphone*

4 0
3 years ago
I need help I do not understand this it's due tomorrow
Goshia [24]
I'll help you out with 3 questions.
For #1, you kind of figured it out yourself
That 90 degree angle on paper means that m/1 and m/2 make up 90
If m1 is 50, then just subtract m1 (50) from 90, making it 40. m/2 is 40

If Angle M4 is 45 degrees then angle M3 is 180-45 since they both make up a 180 degree angle.

There are 180 degrees in a triangle
If m 8 = 78
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8 0
3 years ago
How do i solve z^2+9=10z
Musya8 [376]

Answer:

z = 1, z = 9

Step-by-step explanation:

Given

z² + 9 = 10z ( subtract 10z from both sides )

z² - 10z + 9 = 0

Consider the factors of the constant term (+ 9) which sum to give the coefficient of the z- term (- 10)

The factors are - 1 and - 9, since

- 1 × - 9 = 9 and - 1 - 9 = - 10, thus

(z - 1)(z - 9) = 0 ← in factored form

Equate each factor to zero and solve for z

z - 1 = 0 ⇒ z = 1

z - 9 = 0 ⇒ z = 9

3 0
3 years ago
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