Let x = number of 20p coins
10+50+20x=200 10p + 50p + x(20p) = 200p (100p=1 pound)
60 + 20x = 200
subtract 60 from each side
20x=140
divide both sides by 20
x=140/20=14/2=7
x=7 James has 7 20p coins
When conducting research on color blindness in males, a researcher forms random groups with five males in each group. The random variable x is the number of males in the group who have a form of color blindness. Determine whether a probability distribution is given. If a probability distribution is given, find its mean and standard deviation. If a probability distribution is not given, identify the requirements that are not satisfied.
x P(x)
0 0.669
1 0.278
2 0.048
3 0.004
4 0.001
5 0.000
1. Does the table show a probability distribution?
A Yes, the table shows a probability distribution.
B. No, the random variable x's number values are not associated with probabilities.
C. No, not every probability is between O and 1 inclusive.
D. No, the sum of all the probabilities is not equal to 1.
E. No, the random variable x is categorical instead of numerical.
2. Find the mean of the random variable x.
a. mu = male(s).
b. the table does not show a probability distribution.
3. Find the standard deviation of the random variable x.
a. infinity = male(s).
b. the table does not show a probability distribution.
Answer:
1. Yes, the table shows a probability distribution.
2. 0.39 males.
3. 0.6082 males.
Step-by-step explanation:
The random variable x is the number of males in the group who have a form of color blindness. Determine whether a probability distribution is given:
A probability distribution is given if the sum of all probabilities is 1.
We have that:
0.669 + 0.278 + 0.048 + 0.004 + 0.001 + 0 = 1
So yes, the table shows a probability distribution.
2. Find the mean of the random variable x.
We multiply each value by its probability. So
[tex]\mu = 0*0.669 + 1*0.278 + 2*0.048 + 3*0.004 + 4*0.001 + 5*0.000 = 0.39[/tex]
The mean is 0.39 males.
3. Find the standard deviation of the random variable x.
Square root of the subtraction squared of each value and the mean, multiplied by its respective probability. So
[tex]\sigma = \sqrt{0.669*(0-0.39)^2+0.278*(1-0.39)^2+0.048*(2-0.39)^2+0.004*(3-0.39)^2+0.001*(4-0.39)^2+0.000*(5-0.39)^2} = \sqrt{0.3699} = 0.6082[/tex]
The standard deviation is of 0.6082 males.
HELP PLEASE CORRECT ANSWER PLEASE
Answer:
96 units^2
Step-by-step explanation:
(8*24)/2
Maths question is very hard
Answer:
I cant quite see the question or understand what your asking.
2. En un concierto hay 432 personas. Si sabemos que hay 48 mujeres más que hombres,
¿Cuántos hombres y cuántas mujeres hay?
Which of the fractions accurately represents the ratio of the orange area to the light blue area in the circle graph shown?
A) 3/10
B) 2/7
C) 7/2
D) 26/5
Answer:A
Step-by-step explanation: Because you fill in 10 with 3 as many times as you can to get your answer.
1 2 /3 − 4 /5 =
Can you please help me
Answer:
hope it helped you...! :)
An amoeba divides to form two amoebas after one hour. One hour later, each of the two
amoebas divides to form two more. Every hour, each amoeba divides to form two more.
1. How many amoebas are there after 1 hour?
2. How many amoebas are there after 2 hours?
3. Write an expression for the number of amoebas after 6 hours.
Answer: 2 1 4
Step-by-step explanation: cant say.
9. After a mild heart attack, Mary spent 3 days in a coronary care unit. Her
room bill was 2,898. What was her daily room rate ?
answer pls ill give bainliest!
Answer:
the right scale factor is 2.5
Step-by-step explanation:
just divide 5 by 2
Answer:
False im not sure sorry
which is is the principal value of sin -1 ( 1 )
Answer:
-0.01745240644 according to my calculator
A system of equation is shown below.
2x + 3y = 34
y = 5x
What is the value of x + y ?
Answer: 29
Step-by-step explanation:
2 + 3 = 5
34 = 5 = 29
easy 5th grade math please look at photo and answer. Giving brainliest!!
differentiate y=a/x+b with respect to x, when a and b are constant
Answer:
-a/(x+b)²
Step-by-step explanation:
Given the function y = a/x+b
To differentiate, we will use the quotient rule.
dy/dx = (Vdu/dx-Udv/dx)/V²
Let u = a
v = x+b
Note that differential of a constant is zero
du/dx = 0
dv/dx = 1
Substitute
dy/dx = (x+b)0 - a (1)/(x+b)²
dy/dx = 0 - a/(x+b)²
dy/dx = -a/(x+b)²
Can someone help me? I’ll reward points + brainalist
Step-by-step explanation:
2) 85° = (3x - 5)° [Vertically Opposite Angles]
=> 3x - 5 = 85
=> 3x = 85 + 5
=> 3x = 90
[tex] = > x = \frac{90}{3} [/tex]
=> x = 30
Hence,
Required value of x is 30
3) B. a triangle with measurements of 2, 3 and 5 inches
AS,
Here,
2 + 3 = 5.
And according to Triangle Inequality Property measurement of any two sides of the triangle should be greater than the third side.
So a triangle can't be made.
A video game system and several games are sold for $616. The cost of the games is 3 times as much as the cost of the system. Find the cost of the system and the cost of the games.
Cost of the video game system s
you have decided to give your best friend a bag of
red and green marbles for his birthday. your friend
likes green marbles better than red ones, so the
bag has twice as many green marbles as red. The
label on the bag says it lcontains a total of 84 marbles.
How many green marbles are in the bag? Write a
System of equations for this problem. Then solve the
problem using any method you like. Be sure to check
your solutions
Answer:
There are 28 red marbles and 56 green marbles in the bag.
Step-by-step explanation:
Let's define:
R = number of red marbles in the bag.
G = number of green marbles in the bag.
We know that:
"There is a total of 84 marbles in the bag"
Then we can write this as:
R + G = 84
"The bag has twice as many green marbles as red marbles"
Then:
G = 2*R
So we have two equations:
R + G = 84
G = 2*R
This is the system of equations we need to solve.
To solve this, we usually start by isolating one of the variables in one of the equations, here we can see that G is already isolated in the second equation, then we can ignore the first step.
Now that we have an isolated variable, we can replace it in the other equation, then we can replace the second equation in the first one to get:
R + G = 84
R + (2*R) = 84
3*R = 84
R = 84/3 = 28
This means that there are 28 red marbles in the bag.
Now we can use the equation:
G = 2*R
To find the number of green marbles, where we need to replace R y 28, then we get:
G = 2*28 = 56
Which means that there are 56 green marbles.
Find angle 1 pleasee :)
Answer:
its the one on the right side
Answer:the one on the right side
Step-by-step explanation:
Helppppppppppp meeeeeeeeee
Answer:
The Area is 13 sq m
Step-by-step explanation:
hope it helps you..
Answer:
22 is right answer I think
Please help- will give brainlist
Answer:
m(JCA)
Step-by-step explanation:
C is the central angle here (the one in between)
so it will be m(JCA) or m(ACJ)
is 1.3 million bigger than 65 million
Answer:
no
Step-by-step explanation:
because 1.3m is small
and 65M is very big I need 65m
Find t.
Write your answer in simplest radical form.
Special right triangles
The bake sale raised $60.00. If each cookie cost $0.75, how many cookies were sold
Pls help help help.
Hello!
[tex]\large\boxed{80 \text{ cookies}}[/tex]
To find the amount of cookies sold, we will need to divide the cost of each cookie from the total raised. Therefore:
Let c = cookies sold
60 = 0.75c
Divide both sides by 0.75:
60 / 0.75 = c
c = 80 cookies.
Write a proof for the statement If a quadrilateral is a square, then the quadrilateral is a rectangle
Answer:
this is because a quadrilateral is a four sided polygon.
and this means square and rectangle are quadrilaterals.
How many meters are the
Convert 5.2kg to grams.
Answer:
5.2kg = 5,200 grams
Step-by-step explanation:
I hope it helps
What would be the volume to this equation?
Answer:
you times 11.3 by 15.1 then times it by 18.9
given triangle ABC if abgleA=25degrees, angle B=75degreesand a=14 what is the length of side b to the nearest whole number
Answer:
did you get the answer i have this question right now plz lmk
Step-by-step explanation:
math is so hard:
For which function is the ordered pair (4, 12) not a solution?
1. y = 3 x
2. y = 16 - x
3. y = x + 8
4. y = 8 - x
what’s the answer?
Answer:
4. y = 8 - x is the right answer
Answer:
4. y = 8 - x
Step-by-step explanation:
The question asks for which function is the ordered pair not a solution?
We need to substitute the ordered pair (4, 12) into x and y.
1. 12 = 3(4) (correct)
2. 12 = 16 - 4 (correct)
3. 12 = 4 + 8 (correct)
4. 12 = 8 - 4 (incorrect)
Therefore, the solution to your question is option 4.
Which of the following best describes the slope of the line below?
A. Positive
ОО
B. Negative
O C. Zero
O D. Undefined
Todd has $56.24 in his bank account. After his paycheck was deposited, he had $224.96 in his account. How much was his paycheck?
The same honey is sold in two different size jars.
Small Jar
Large Jar
510g for £4.39
380g for £3.12
By considering the amount of honey per penny, work out
which jar is the best value for money.
Working must be shown.
Answer:
Large Jar:
510/439= 1.16p per 1g of honey
Small Jar:
380/312= 1.21p per 1g of honey
Therefore the Small Jar is best value for amount of honey per penny
Please Mark as Brainliest!