The following table shows the probability distribution for the number of books a student typically buys at the annual book fair held at an elementary school.
Number of Books
0
1
2
3
4
5
6
7
Probability
0.35
0.20
0.15
0.10
0.07
0.08
0.04
0.01
Let the random variable B represent the number of books a student buys at the next book fair. What is the expected value of B?
A
0
B
1.00
с
1.79
D
3.50
E
28
acer

Answers

Answer 1

Answer:

1.79

Step-by-step explanation:


Related Questions

can someone answer these question

Answers

Answer:

y=5

Step-by-step explanation:

Given x=1, the equation would come to be y = 5^1, or y equals 5 to the first power. You'll need to focus on the 5^1, 5 to the first power is 5, that's your answer.

A bag contains 324 sweets Amelia takes 1/9 of the sweet from the bag the remaining sweets are divided between Isabella and Olivia in the ration 1:5 how many sweet dose Olivia have ?

Answers

Answer:

Olivia has 240.

Step-by-step explanation:

Amelia took 36 and there were 288 left over. A ratio of 1:5 with 288 would be 48 and 240 so therefore, Olivia has 240.

Algebra 2!!

The equation of the piecewise function f(x) is below. What is the value of f(3)?

Answers

Answer:

5

Step-by-step explanation:

Ask your self which equation you should use. Since it says F(3) then we have to find an equation that would fit this correctly. For example if we look at -X^2, X<-2 we could see that 3 is clearly not less than -2, leading to the conclusion that this is not the right equation.. If you look at the last equation it says that x has to be greater/equal to 0 which is true. So then we are left with the equation...

F(3)=x+2

F(3)=3+2

F(3)=5

FIRST CORRECT ANSWER GETS BRAINLIEST - 100 POINTS

Answers

Answer:

110cm

Step-by-step explanation:

With the slice, we know that we need to find the area of a triangle with a base of 10cm and a height of 22cm.

Let 10 be x and 22 be y.

Substitute this into the equation for finding the area of a triangle.

[tex]\frac{x*y}{2}[/tex]

Which now becomes

[tex]\frac{11*20}{2}[/tex]

Which now becomes

[tex]\frac{220}{2}[/tex]

Now solve.

[tex]\frac{220}{2} = 110[/tex]

Your answer is 110cm.

Hope this helps. Have a nice day. Oh, and one more thing. Surprised that I'm not stealing points?

a person ate 2000 calories in a day of those calories 35% were from fat how many calories are from fat​

Answers

Answer:

700

Step-by-step explanation:

What is the principal which would amount to $6900 in 3 years at 5% simple interest per annum?​

Answers

Answer:

$6000

Step-by-step explanation:

accumulated amount = A = PI

A = $6900

Let P = x

6900 - I = x

I = (x)(0.05)(3yrs) = 0.15x

6900 - 0.15x = x

Add

6900 = 1.15x

Divide, solve for x

x = 6000

5. Sarah has 5 less dollars than Jessica. Sarah has 17 dollars.
A: Write an equation that describes this solution.
B. What is the solution to the equation?

Answers

Answer:

A. J = 17 + 5

B. J = 22

Jessica has $22.

Answer:

22

Step-by-step explanation:

17+5 because the 5 represents how many more do jessica got and 17 means how much sarah got it total

Slope intercept form of 4x+4y=-32

Answers

Answer:

y = - x - 8

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c

Given

4x + 4y = - 32 ( subtract 4x from both sides )

4y = - 4x - 32 ( divide all terms by 4 )

y = - x - 8 ← in slope- intercept form

Answer:

x+y=-8

Step-by-step explanation:

-32=4x+4y

-4y=4x+32

y=(4x+32)/-4

y=-x-8

x+y=-8

Now comparing to slope intercept form

y=mx+c,we get

slope =1

y intercept =1

y=-8

Simply the experission 53+3(5-3)

Answers

Answer:

59 is the Answer

Step-by-step explanation:

53+3(5-3)

53+15-9

68-9

59

the answer to it is 59 but i don’t understand how to simplify it

Help pls ASAP I need it now plss

Answers

She or he payed
C. 18.80

Answer:

18.8

Step-by-step explanation:

All you do is multiply 47 by 40%.

You can also multiply it by 60% then do 47 minus 28.2

Rs + 14s when r is 6 and s is 1/4

Answers

Answer:

its 5 answer is 5

Step-by-step explanation:

5 is the a swer

Please please please help me!!! I need this really fast and quick. Will give brainliest to whoever can answer quickly please

Answers

No, she is wrong. A rotation in 180 would result in A(-4,1) to be A’(4,-1) but instead A’ in the graph is (1,4) meaning they did a rotation 270 degrees.

Phil made a number line showing the multiples of 3/6...

What is the product 2 x 3/6?

Answers

the answer would be 6/6 because they want you to multiply 2 x 3/6

A jewelry store makes rings for $27. They sell the rings at a 78% markup. How much would you pay retail for a ring? Show your work.


want a brainlist
1-answer correct
2-explain correctly
3-be first to answer(this makes the chance higher for you to get the brainlist)

Answers

Answer: $48.06

Step-by-step explanation:

Simply take the sales price minus the unit cost, and divide that number by the unit cost. Then, multiply by 100 to determine the markup percentage. For example, if your product costs $50 to make and the selling price is $75, then the markup percentage would be 50%: ( $75 – $50) / $50 = . 50 x 100 = 50%.

Answer:

You would pay $48.06

Step-by-step explanation:

27*0.78 = 21.06

27 + 21.06 = 48.06

3. A pitcher of water contains 1/4 liter of water. The water is poured equally into 5 glasses.
a. how many liters of water are in each glass? (EXPLAIN)
b. Write the amount of water in each glass in MILLILITERS.

Answers

Answer: 1/20

Step-by-step explanation:

1/20 liters because 5 times 4/1 (5 divided by 1/4) equals 1/20

whats the answer to 5+ -5

Answers

Answer:

The answer is Zero.

Step-by-step explanation:

Adding a negitive 5 to a positive 5 cancels out

Answer:

0

Step-by-step explanation:

It's a negative five, meaning that if you are adding it, the number will still go back.

You made $5, but you're in debt of $5. So even though it is supposed to go up, it goes down back to 0 due to the debt, which is the negative.

Which answers are equivalent to 85 ? Choose two answer.
8+8+8+8+8
8*5
8 *9*8*8*8
5+5+5+5+5+5+5+5
32768

Answers

Answer: there all 40 but  for 32768 because its 32768 and 8 *9*8*8*8 because its 36864

In AEFG, the measure of ZG=90', the measure of ZE=51°, and FG = 5.2 feet. Find
the length of EF to the nearest tenth of a foot.

Answers

Answer: 6.7 feet

Step-by-step explanation: sin 51= 5.2/x

xsin51= 5.2

xsin 51/sin 51 = 5.2/sin 51

​x= 5.2/sin 51 =6.6911≈ 6.7 feet

Answer for ( brain list, thanks, 5 star review)

Answers

Answer:

Your answer is 4.99

Step-by-step explanation:

259.48/52 will take some work if you use long division, but eventually you  get your answer of 4.99

Solve this to get 25 points. Correct answer gets brainliest!

Answers

Answer:

T = 59

U = 27

V = 94

Step-by-step explanation:

(5x +4) + (8x + 6) + (2x+5) = 180

15x + 15 = 180

15x = 165

x = 11

Solve
Help mee please

Answers

1/2 Square equals to 1/4 equals to x over 5 2 Square

therefore 1/4 equals to x over 5 2 square

Equals to 1/4 equals to x over 5 * 4 you know that 2 square equals to 4

So now I'm going to solve for 1/4 equals to x of over 5 * 4 equals to 20

1/4 equals to x over 20

1/4 equals to 20 cross multiply

= 1\4 = x/20

= 4 * x = 20*1

4x = 20

divide both side by the coefficient of x

4x/4 = 20/4

x =5

A kennel has 90 dogs in total, some are puppies and some are adult dogs. The ratio
of puppies to adult dogs in a kennel is 3:2. How many adult dogs are there?

Answers

Answer:

36

Step-by-step explanation:

90÷5=18

18×2=36

We multiply two because the ration for adults is 2

Henry walked 3 miles and Sasha walked 12 miles.
Sasha says she walked 9 more miles than Henry.
Henry says that Sasha walked 3 times as many miles as he walked. Who is correct?

Answers

Sasha because Sasha didn’t run 9 miles

A bike trail is drawn on a coordinate system. Each end of the trail is an x-intercept. The height of the trail is modeled by the function h(x) = -0.1x^2 - 0.3x +2.8 , where x is the horizontal distance in kilometers. How many meters is the horizontal distance of the trail?

Answers

Answer:

4metres

Step-by-step explanation:

Given the height of the trail modeled by the function h(x) = -0.1x^2 - 0.3x +2.8 , where x is the horizontal distance in kilometers

The horizontal distance occurs at the x intercept i.e at h(x) = 0

Substitute

0 = -0.1x^2 - 0.3x +2.8 ,

Multiply through by -10

0 = x^2 + 3x - 28

x^2 + 3x - 28 = 0

Factorize

x^2 + 7x - 4x - 28 = 0

x(x+7) - 4 (x+7) = 0

(x-4)(x+7) = 0

x-4 = 0 and x+7 = 0

x = 4 and -7

Since the danced cannot be negative, hence the horizontal distance of the trail is 4m

Read the following situation:

There are 13 animals in the barn. Some are chickens and some are pigs. There are 40 legs in all. How many of each animal are there?

When setting up the system, what could the variables represent? Select all that apply.

Total number of chicken legs

Total number of pigs

How long until the number of pigs and chickens are equal.

How many animals in the barn

Total number of pig legs

Total number of chickens

Where the lines cross

Answers

Answer:

Hi, let's turn the word problem into a set of equations:

Let's say that x = # of chickens, and y = # of pigs

If there are 13 animals altogether, that means that

x + y = 13

If there are 40 legs together, we know that chickens have 2 legs, while pigs have 4, so the total number of legs would be:

2x + 4y = 40

We now have two different equations, with the same two variables, so we can rearrange and substitute one equation into the other to solve. We can rearrange the first equation as:

x + y = 13

x = 13 - y

Let's plug this expression for "x" into the second equation:

2(13-y) + 4y = 40

Now we have an equation with only one variable, so we can use algebra to solve for y:

26 - 2y + 4y = 40

2y = 14

y = 7, there must be 7 pigs.

From the first equation that we rearranged,

x = 13 - y

Now that we know the numerical value of "y", we can plug that in:

x = 13 - 7

x = 6, there must be 6 chickens

what is the sum of the measures of the interior angles of a hexagon ​

Answers

Answer:

Hexagon has 6, so we take 540+180=720. A heptagon has 7 sides, so we take the hexagon's sum of interior angles and add 180 to it getting us, 720+180=900 degrees.

Hexagon has 6, so we take 540+180=720

what is a circumference ​

Answers

Answer:

25.13

Step-by-step explanation:

2 pie  multiply radius

2 pie multiply  4

( I think so)

I hope this helps

Cece is finding the surface area of a square pyramid by finding the sum of the areas of its faces. Which statement best describes the faces of the pyramid?
A)one square and three triangles
B)one square and four triangles
C)three squares and one triangle
D)three squares and two triangles

Answers

Answer:

D. One square and four triangles

Step-by-step explanation:

Cece is finding the surface area of a square pyramid by finding the sum of the areas of its faces

Square pyramid has a square base.

each edge of the square base joins at the top of the vertex to make a pyramid

The sides of the pyramid is a triangle

the square has 4 sides, so four triangle on the sides of the pyramid

Hence one square and four triangles forms a square pyramid

Answer:

The answer is A). one square and three triangles

Step-by-step explanation:

If i'm incorrect pleas let me know.

A circle has a diameter of 4 inches. Which statement about the area and circumference of the circle is true?​

Answers

The numerical values of the circumference and area are equal.

Answer:

To simplify it a

Step-by-step explanation:

Find the area of triangle STU

Help me

Answers

Answer:

12cm cubed

Step-by-step explanation:

A= base*height/2 so base is 6 just count the squares and height is 4 at the highest point  so just plug those in the formula hopefully its correct

Answer: 35 cm2

Step-by-step explanation:

The height is 5

and the base is 7

area of triangle = bxh    

                          = 7 x 5

                           = 35 cm2

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