Mathematics College

the mean weight of 100 students in a certain class is 71kg the mean weight of boys is 65kg and that of girls is 75kg what is the number of boys and girls​

Answers

Answer 1

Answer:

There are 60 girls and 40 boys in the class.

Step-by-step explanation:

Given that the mean weight of 100 students in a certain class is 71kg, while the mean weight of boys is 65kg and that of girls is 75kg, to determine what is the number of boys and girls the following calculation must be performed:

1 x 75 + 0 x 65 + 75

0.9 x 75 + 0.1 x 65 = 74

0.8 x 75 + 0.2 x 65 = 73

0.7 x 75 + 0.3 x 65 = 72

0.6 x 75 + 0.4 x 65 = 71

Thus, there are 60 girls and 40 boys in the class.

Related Questions

Item 20 Two groups leave on different flights from the same airport. Group A flies 130 miles due west, then turns 24° toward north and flies 45 miles. Group B flies 130 miles due north, then turns 32° toward east and flies 45 miles. Which group is farther from the airport?

Answers

Answer:

Group A

Step-by-step explanation:

Since in total they moved the same amount of miles then the one with the least turnback (angle in this case) would be farther

There is a bag filled with 5 blue and 6 red marbles.
A marble is taken at random from the bag, the colour is noted and then it is replaced.
Another marble is taken at random.
What is the probability of getting 2 blues?


PLZ answer fast its an emergancy

Answers

Answer:

5/11*5/11=25/121

Step-by-step explanation:

There are 6+5 marbles.

Of those, 5 are red.

The chances of drawing a red marble are 5/11

Since you replace the marble you drew, the chances each draw remain 5/11

You cannot draw two red marbles without drawing a red marble on your first draw, so the odds of you making a second draw are 5/11. The odds of that also being red are 5/11… but we only care about that 5/11ths the time

HELP! WILL GIVE BRANLIEST!

Answers

Answer:

0

Step-by-step explanation:

There is no slope, but a no slope line is vertical. Therefore making this a zero slope. I hope this helps :)

Answer:

No slope

Step-by-step explanation:

there is no slope because its a flat line, a slope would be an uneven line, or a diagonal

a store receives 8 boxes of Picture frames to sell. Unfortunately, 3 of the frames are broken and cannot be sold. There are 45 left that can be sold. The Store manager wants to know how many frames are in each box

Answers

Answer:

6

Step-by-step explanation:

45/8=5.62

round it to 6

There are 6 frames in each box.

What is equation modelling? What is a mathematical equation and expression?Equation modelling is the process of writing a mathematical verbal expression in the form of a mathematical expression for correct analysis, observations and results of the given problem.A mathematical expression is made up of terms (constants and variables) separated by mathematical operators.A mathematical equation is used to equate two expressions.

Given is that a store receives 8 boxes of Picture frames to sell. Unfortunately, 3 of the frames are broken and cannot be sold. There are 45 left that can be sold.

Assume that the number of frames in each box are [x]. Then, we can write -

8x = 45 + 3

8x = 48

x = 6

Therefore, there are 6 frames in each box.

To solve more questions on functions, expressions and equation modelling, visit the link below -

brainly.com/question/17421223

#SPJ2

Which expression is equivalent to 15x + 3?
A. 15(1x + 1)
B. 5(3x + 1)
C. 3(5x + 1)
D. 2(15x + 3)

Answers

Answer:

C

Step-by-step explanation:

3(5x + 1) | Given

15x + 3 | Multiply each term on the inside by the number on the outside of the parenthesis (3). This is called distributing.

C.) 3(5x+1)

Explanation: you use the foil method to distribute the 3.

A bond has a $1,000 par value, nine years to maturity, and pays a coupon of 5.25% per year, semiannually. The bond is callable in three years at 115% of its par value. If the bond’s yield to maturity is 5.32% per year, what is its yield to call?
Please show work. Or explain how to get answer through the calculator.


A) 9.08%


B) 9.24%


C) 9.86%


D) 9.62%


E) 8.96%

Answers

Answer:

C) 9.86%

Step-by-step explanation:

Given that:

Par value of the bond = $1000

Coupon rate = 5.25%

Years of maturity = 9

years to call = 3

price to call = 115% *  1000 = 1150

YTM of the bond = 0.0532

Using Excel formula:

The current price of the bond = P-V(0.0532/2, 9*2, 0.0525*1000/2, 1000)

= $995.04

The yield to call = 2 * RATE( 3*2, 0.0525*1000/2, 995.04, 1150)

The yield to calll = 9.86%

y2-4y+4/(2-6y) x (2y+4)/(3y2-12)​

Answers

Answer:

what is the question? please ask a question.

A Arrange the following integers in ascending order
1) 37, 41, 76, -2.25 -25
Answer: ​

Answers

ASCENDING ORDER

76,41,36,25,-2,-25

Answer:

1234567891011121314151617181920

Which ordered pair is a solution of the inequality y<3x+1?

A) (-3,-2)
B) (3,14)
C) (1,-3)
D) (1,6)

Answers

Answer:

c) (1,-3)

Step-by-step explanation:

-3<3(1)+1

-3<3+1

-3<4

4x+3y=2
2x+y=6
substitution

Answers

Answer:

(8,-10)

Step-by-step explanation:

4x+3y=2

2x+y=6--->y=-2x+6

4x+3(-2x+6)=2

4x-6x+18=2

-2x=-16

x=8

4(8)+3y=2

32+3y=2

3y=-30

y=-10

Answer:

x=8 y=-26/3

Step-by-step explanation:

2x+y=6

2x=6-y

2x-6=-y

-2x+6=y

4x+3(-2x+6)=2

4x-6x+18=2

4x-6x+16=0

-2x+16=0

-2(x-8)=0

x-8=0

x=8

4(8)+3y=6

32+3y=6

26+3y=0

3y=-26

y=-26/3

Z = 2x - y
maximum
minimum
AY
(7,9)
(2,6
S
(2, 2)
(10.1)

Answers

My dog is licking my toes ಥ_ಥ

On a circle graph, a section that represents 80% of the graph has a central angle measure of 288º.
True
False

Answers

Answer: true

Hope this helps (:

HELP ME PLZ SURFACE AREA OF A RAMP

Answers

Answer:

i think it 37 square feet

In the diagram, each shape has a value and the sums of the shapes in each of the first three rows is given. Find the sum of the shapes in the fourth row.

Answers

Answer:

26

Step-by-step explanation:

2 squares + 3 circles = 31. So, the sum of the squares is divisible by two, and the sum of the circles is divisible by 3. Then, I used trial and error to figure out that the square's value is five, and the circle's value is seven. 5 + 7 + 7 = 19. 27 - 19 = 8. The triangle's value is eight. 5 + 7 + 12 = 24. It works. 15 + 7 + 4 = 26

Answer:

26

Step-by-step explanation:

i did it i got it correct!!!

3. Part way through his party, Patrick found that there was 5 2/3 pizzas left. If his friends eat 3/4 of the pizzas, how much of the 5 will they eat? Write and solve an equation that will help you figure out how much of the remaining pizzas will be eaten. Explain the steps you took to solve the problem.​

Answers

Answer:

4 1/4

Step-by-step explanation:

Convert 5 2/3 to an improper fraction. 3 x 5 = 15 + 2=17

17/3 x 3/4 = 51/12= 4 1/4 of the remaining pizza will be eaten

Answer: 4 1/4

Step-by-step explanation:

how many different ways could first, second, and third place finishers occur in a race with six runners competing?

Answers

Answer:

720

Step-by-step explanation:

This is a permutation since the order at which the people are picked matter due to the fact that it is a race. Using the permutation formula

P= n!/ (n-r)! you can find the different ways the race would end. n stands for the total number of objects in the set while r stands for the number of objects chosen from said set. Then you plug in the numbers in the formula: P= 10!/(10-3)!= 720

720 hope it help :)





6. Which of the following is equivalent to (17m + 3) + (3m - 1)?
A. 14m + 2
B. 14m + 4
C. 20m + 2
D. 20m +4

Answers

Answer:

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

C

6. A basketball team averaged 105 points per
game. How many points did the team score
ed
Bernd Melman Alamy
in 6 games?

Answers

105 divided by 6 = 17.5
105 pt per 1 game. in 6 games they scored 630 points. 105 x 6

can someone help me solve these two problems? i need to find what x is.

Answers

Answer:

1. x=2

2. x= 0.33

Step-by-step explanation:

1.So to start off you have a coefficient for 2 so you have to find what 2 to the power of 2 is =4 so then you have your new problem 4x+5=13 next you need to get 4x by itself so

-5 -5

then you have 4x=8. you divide by 4 on both sides

4. 4

so then you get x=2

2.So same here find what 3 to the power of 2 is =9

New equation 4x-1=9x+4x-4. Then combine like terms on the right you cant do it on the left because that is a separate part and those dont merge like terms so

9x+4x = 13x

new equation. 4x-1=13x-4

next subtract 4x on both sides

13x-4x=9x

new equation. -1=9x-4

next add 4 to both sides

-1+4= 3

new equation. 3=9x

so then divide 9 on both sides

3÷9= 0.33

x= 0.33

Hope this made sense and helps

Please help with this

Answers

9514 1404 393

Answer:

  153 square units

Step-by-step explanation:

The figure is drawn in the attachment with some lengths and points labeled.

The figure can be considered to have an area that is the sum of the areas of rectangle ABFE and triangle FGH, with the area of triangle BCD subtracted.

That area is ...

  A = area(ABFE) +area(FGH) -area(BCD)

  = (15)(9) +(1/2)(9)(6) -(1/2)(6)(3)

  = 135 +27 -9 = 153 . . . square units

Answer this, please! Anybody

Answers

Answer:

1/4 and 1/8 which shold multiply

Step-by-step explanation:

What is 45.56 rounded to the tenths place?

Answers

Answer:

45.6

Step-by-step explanation:

Answer:

45.6

Step-by-step explanation:

6 is greater than 5 so it rounds up

Suzie is measuring furniture for her bedroom. She does not have a tape measure or a ruler. Instead, she uses her book. She knows that the length of her book is 8 inches.

Answers

Answer:

book x 8

Step-by-step explanation:

20.) Using the cross multiplication method, which of the following is the solution to 18/6x = 4/(x+3)?


a)9


b)-9


c)12


d)-12

Answers

Answer:

B. 9

Step-by-step explanation:

A jar with 13 marbles, 2 are red, 1 green, the rest blue.
P(blue) =

Answers

There should be 10 blue marbles in the jar because 2+1-13=10

P=10

Hope this helps :)

20 is 80% of what number?

Answers

It’s 25. Hope this helps ✌️

Answer:

25 is answer.

80% of x=20

x=20×100/80=25

how do I decease 7 by 3%​

Answers

Answer:

6.79

Step-by-step explanation:

First of all, you will have to know how much is 3% of 7 in order to decrease it by that amount.

7 x 0.03 = 0.21

Now that you know the amount, you can subtract it from seven and therefore you have decreased 7 by 3%.

7 - 0.21 = 6.79

Answer:

Percentage decrease = 7 × 3%

7 - Percentage decrease = 7-(3% x 7)= 7 - 3% x 7=7 x (1 - 3%)= (100% - 3%) × 7 = 97% x 7 = 679%

Maya says there are 4 hundreds in 5,467. Jenny says there are 54 hundreds in 5,467 they're both right.​

Answers

Answer:

Both are right

Step-by-step explanation:

As maya say 4 hundreds in 5,467

this is right because the place value of 4 in 5467 is 4 hundreds = 400.

but Jenny says 54 hundreds in 5,467

this also correct because number 5467 in word is five thousand four hundred and sixty seven

54 hundreds = 54 × 100 = 5400

as here place value of 5 is 5000 and place value of 4 is 400

so, Addition of both gives = 5000 + 400 = 5400

If we divide 5400 by 100, we would have 54

It shows that there are 54 hundreds

so, Both are right

17) A baseball coach records the height at every second of a ball thrown in the air. Some of the data points
appear in the table below: Which equation is a quadratic model for the data?
Time (s)
0
1
3
Height (ft)
0
64
96
A) h = -16t? + 80t
B)h = -48t2 + 112t
C) h = -32t2 + 80t
D) = -16t2 + 640

Answers

Answer:

be smarter

Step-by-step explanation:

Find the number that makes the ratio equivalent to 11:1.
?:4

Answers

Answer:

The unknown is 44

Step-by-step explanation:

We need to solve for x in the proportion given by :

11 / 1 = x / 4

multiply both sides by 4 to isolate x

11 * 4 / 1 = x

x = 44

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