1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alexxx [7]
3 years ago
13

if the ratio of boys to girls in a class is 5-13 what is the ratio of girls to all the students in the class

Mathematics
1 answer:
enyata [817]3 years ago
3 0

Answer:

supposing there are only 18 students, Im guessing the ratio would be 12-18?

Step-by-step explanation:

You might be interested in
What does 2miles=yards?
KiRa [710]

2 miles = 3520 yards.

Hope this helps! :D

5 0
3 years ago
Could u help me with these 3 questions? Ill mark brainly if its correct. :)
Kazeer [188]
Answer is

2. 15
3.- 18
4. 92
3 0
3 years ago
In a multiple choice quiz there are 5 questions and 4 choices for each question (a, b, c, d). Robin has not studied for the quiz
Ahat [919]

Answer:

a) There is a 18.75% probability that the first question that she gets right is the second question.

b) There is a 65.92% probability that she gets exactly 1 or exactly 2 questions right.

c) There is a 10.35% probability that she gets the majority of the questions right.

Step-by-step explanation:

Each question can have two outcomes. Either it is right, or it is wrong. So, for b) and c), we use the binomial probability distribution to solve this problem.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}

In which C_{n,x} is the number of different combinatios of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And \pi is the probability of X happening.

In this problem we have that:

Each question has 4 choices. So for each question, Robin has a \frac{1}{4} = 0.25 probability of getting ir right. So \pi = 0.25. There are five questions, so n = 5.

(a) What is the probability that the first question she gets right is the second question?

There is a 75% probability of getting the first question wrong and there is a 25% probability of getting the second question right. These probabilities are independent.

So

P = 0.75(0.25) = 0.1875

There is a 18.75% probability that the first question that she gets right is the second question.

(b) What is the probability that she gets exactly 1 or exactly 2 questions right?

This is: P = P(X = 1) + P(X = 2)

P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}

P(X = 1) = C_{5,1}.(0.25)^{1}.(0.75)^{4} = 0.3955

P(X = 2) = C_{5,2}.(0.25)^{2}.(0.75)^{3} = 0.2637

P = P(X = 1) + P(X = 2) = 0.3955 + 0.2637 = 0.6592

There is a 65.92% probability that she gets exactly 1 or exactly 2 questions right.

(c) What is the probability that she gets the majority of the questions right?

That is the probability that she gets 3, 4 or 5 questions right.

P = P(X = 3) + P(X = 4) + P(X = 5)

P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}

P(X = 3) = C_{5,3}.(0.25)^{3}.(0.75)^{2} = 0.0879

P(X = 4) = C_{5,4}.(0.25)^{4}.(0.75)^{1} = 0.0146

P(X = 5) = C_{5,5}.(0.25)^{5}.(0.75)^{0} = 0.001

P = P(X = 3) + P(X = 4) + P(X = 5) = 0.0879 + 0.0146 + 0.001 = 0.1035

There is a 10.35% probability that she gets the majority of the questions right.

6 0
3 years ago
The answer, and work shown.
hoa [83]
Slope= 1/2
Y intercept= (0,2)

Explanation:
Slope-intercept form is y=mx+b
-2x+4y=8
-8-2x=-4y
Divide by -4
2+1/2x=y

Y=1/2x+2
5 0
3 years ago
What is the solution of this equqtion? 4+ 1/4 w=6​
ale4655 [162]

Answer:

w = 8

Step-by-step explanation:

4+ 1/4 w=6​

Subtract 4 from each side

4-4+ 1/4 w=6​-4

1/4w = 2

Multiply each side by 4

4* 1/4 w=2*4

w = 8

4 0
3 years ago
Other questions:
  • What is a chemical change also known as?
    15·2 answers
  • Please help! Will give brainliest to correct answer!
    14·1 answer
  • Find the critical point of the function f(x) = x2 + 2x - 3.
    14·1 answer
  • Simplily the product<br>5/n+1 × n+1/n+3​
    7·1 answer
  • Antwan wants to know how often the residents in his neighborhood go to the beach. Which sampling method will give valid results?
    5·2 answers
  • Seven bags of peanuts and 3 sandwiches cost 22. Three bags of peanuts and 1 sandwiche cost 8. The cost of 1 bag of peanuts is.on
    14·1 answer
  • Find the following quantity. 103% of 19 =
    5·2 answers
  • PLEASE HELP!
    8·1 answer
  • Heelp. I will give brainliest to whoever answers correctly.-
    10·1 answer
  • Can someone please help me??
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!