Urgent please!!! I really don’t understand it, tysm to anyone who can answer thissss :))))

Urgent Please!!! I Really Dont Understand It, Tysm To Anyone Who Can Answer Thissss :))))

Answers

Answer 1

Given:

The frequency distribution table.

To find:

The mean average score on a test.

Solution:

The frequency distribution table is

[tex]Marks (x_i)[/tex]                   [tex]Frequency(f_i)[/tex]                  [tex]f_ix_i[/tex]

     x                                     a                               xa

     y                                     b                               yb

     z                                     c                               zc

  Sum                              a+b+c                          xa+yb+zc

Now, the mean average score on the test is

[tex]Mean=\dfrac{\sum f_ix_i}{\sum f_i}[/tex]

[tex]Mean=\dfrac{xa+yb+zc}{a+b+c}[/tex]

Therefore, the mean average score on the test is [tex]\dfrac{xa+yb+zc}{a+b+c}[/tex].


Related Questions

Explain the meaning of f(0)=0

Answers

The expression f(0) represents the y-intercepts on the graph of f(x). The y-intercepts of a graph is the point where the graph crosses the y-axis.

Please help I need it really really bad

Answers

Answer:

second one lol

Step-by-step explanation: because i  said so

Answer:
B
Explanation;

Which graph represents y=4(3)^x​

Answers

I think it’s d.........

The y-intercept of the exponent function is 4. Then the graph represents the equation y = 4(3)ˣ will be B.

What is an exponent?

Let a be the initial value and x be the power of the exponent function and b be the increasing factor.

The exponent is given as

y = a(b)ˣ

The exponent equation is given below.

y = 4(3)ˣ

The value of the exponent function at x = 0 is calculated as,

y = 4(3)⁰

y = 4 × 1

y = 4

The y-intercept of the exponent function is 4. Then the graph represents the equation y = 4(3)ˣ will be B.

More about the exponent link is given below.

https://brainly.com/question/5497425

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what is 22

+ 60 is it 87 , 650 , or 82, or 67

Answers

Answer:

82

Step-by-step explanation:

vote brainiest plzz

(PLEASE HELP!!) Which is the equation of the line in slope-intercept form?

Answers

Answer:

its a

Step-by-step explanation:

The weather report says there is a 91% chance it will rain tomorrow. Should you get ready to use an umbrella?

Question 1 options:
1 Yes
2 No
3 maybe

Answers

yes
Even if it was 80%, you would still want to bring an umbrella just in case
Maybe. This is because even though it says 91%, the weather changes because of global warming which concludes to there not actually being any exact results but, still take an umbrella just to make sure.

Hope this answer was reasonable for you :)

What’s 1/4 divided by 7 in lowest terms PLEASE HURRY AND ANSWER

Answers

Hmm I think it’s 1/28 and you can’t simplify it more then that hope this helped :)

Find the circumference in terms of pic if the diameter is 2.5

Answers

Answer

[tex]C=2.5\pi[/tex]

Step-by-step explanation:

Radius is always half of the diameter so, [tex]\frac{2.5}{2} \\[/tex] is equal to [tex]1.25[/tex].

The Formula for Circumference is [tex]C=2\pi r[/tex]

Since we found out the radius, we need to basically substitute (or insert) it into the radius spot so the next step will be: [tex]C=2\pi (1.25)[/tex]

Then we multiply (2)(1.25) to get an answer of 2.5 (which we already know)

So our answer is going to be [tex]C=2.5\pi[/tex]

Hope this helped and answers your question! Have a great rest of your day/night!

2. An atom is found to have 32 protons, 40 neutrons, and 32 electrons
a. Recall the mass of a proton, in atomic mass units
Answer:

Answers

Answer: 72 amu

Explanation: The atomic mass equals the sum of the number of protons and the number of neurons.

I need help asap!!!!!
Which of the following possibilities will form a triangle? (5 points)

Side = 15 cm, side = 6 cm, side = 8 cm
Side = 15 cm, side = 6 cm, side = 9 cm
Side = 16 cm, side = 9 cm, side = 6 cm
Side = 16 cm, side = 9 cm, side = 8 cm

Answers

Answer:

16 cm, side = 9 cm, side = 8 cm

Step-by-step explanation:

how do you find area of a shape?

Answers

Answer:

The area of a rectangle is the length times width.

Step-by-step explanation:

Anthony compared dog treat prices to find the better deal. The 2 pound box cost $2.38, and the 5 pound box cost $6.10. Which is the better deal?

Answers

Answer:

2.38 * 5 = 11.9 and 6.10 * 2 12.20 therefore the 2 pound box is the better deal

Step-by-step explanation:

g/4=6

what does g equal also the g/4 is supposed to be a fraction

Answers

Answer:

1.5

Step-by-step explanation:

G/4=6

Multiply 4 my both sides

G=24

Hope this helps

please help me with this!!!​

Answers

Answer:

126 m^2

Step-by-step explanation:

We can use the formula of the area of a parallelogram:

Area = base x height Area = 14 x 9Area = 126 m^2

Hope this helps!!

Answer:126m^2

Step-by-step explanation:

The area of a parallelogram is the same as a rectangle. You must do 9*14=126.

In a classroom 3/5 of the students are boys. What is the ratio of girls to boys

Answers

The ratio of boys to girls is 2:3

‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️An artist is making a scale model of a statue. On the model 2 inches represents 1 foot on the actual statue. Which graph best represents this relationship?

Answers

B. The one the mouse is hovering over

Answer:

The answer would be B !

Step-by-step explanation

Simplify the expression: 12 +6w² + 5m² + 14w + 9m² + 4w + 10​

Answers

Answer:

[tex]14m^{2} + 6w^{2} + 18w +22[/tex]

Step-by-step explanation:

Break the function into pieces and combine like terms:

[tex](9m^{2}+5^{2})=14m^{2}[/tex]

[tex]6w^{2}[/tex]

[tex](14w+4w)=18w[/tex]

[tex](10+12)=22[/tex]

Now arrange the pieces in proper order (order of exponents)

[tex]14m^{2} +6w^{2} +18w+22[/tex]

plz mark me brainliest. ;)

Emily has 59 flowers. She wants to put the flowers in 6 vases with the same number in each vase. Part A: What is the greatest number of flowers she can put in each vase? Part B: How many flowers will Emily have left over?

Answers

Answer:

Part A

= 9 flowers

Part B

= 5 flowers

Step-by-step explanation:

Emily has 59 flowers. She wants to put the flowers in 6 vases with the same number in each vase.

Part A: What is the greatest number of flowers she can put in each vase?

This is calculated as:

59 flowers ÷ 6 vases

= 9 5/6 flowers

Therefore, the greatest number of flowers she can put in each vase is 9 flowers

Part B: How many flowers will Emily have left over?

We have to calculate the number of flowers in the 6 vases above

= 9 flower × 6

= 54 flowers

Hence:

= 59 flowers - 54 flowers

= 5 flowers

Therefore, Emily would have 5 flowers left over.

Need help on this... First one to answer this correctly, I will give you a BRANLIST​

Answers

Answer:

wheres the problem?

Step-by-step explanation:

what is the total surface area of a cylinder with a base of 11m and a height of 7m

Answers

Answer:

V = 1692.46 m3

Step-by-step explanation:

V = π· r2· h

V = π· 72· 11

V = 1692.46 m3

Answer:

Step-by-step explanation:

A=2*π*r*h+2*π*r^2    ( This is the formula for surface area of cylinder )

As given

base = 11m    so we have to get the radius = 11/2 = 5.5m

height=7m

now putt in formula, we get

=2*π·*(5.5)*(7)+2*π*(5.5)^2

=431.96899m^2

A car dealership increased the price of a certain car by 3%. The original price was $39,600.

Answers

Answer:

$40,788

Step-by-step explanation:

3% of 39600 = 1188

increased price = 39600 + 1188 = $40,788

7 - 9x = ( x + 3 ) + 2x

Answers

Answer:

1/3

Step-by-step explanation:

7-9x=(x+3)+2x

7-9x=x+3+2x

7-3=x+2x+9x

4=12x

x=1/3

HELP! 8TH GRADE MATH PLS LOL
——————————————
Find the value of y when x= -8
2y
— = 3x+ 34
3

Answers

Given:-

[tex]{ \large{➢ \: \: \bf{x = - 8}}}[/tex]

Solution:-

[tex]{ \large{➢ \: \: \bf{ \dfrac{2y}{3} = 3 \times - 8 + 34}}}[/tex]

[tex]{ \large{➢ \: \: \bf{ \dfrac{2y}{3} = - 24 + 34}}}[/tex]

[tex]{ \large{ \bf{ ➢ \: \: \cancel{2}y = 3 \times { \cancel{(10)} {} \: \: ^{5} }}}}[/tex]

[tex]{ \large{ \therefore{ \bf{y = 15 \: \: Ans.}}}}[/tex]

Please help, will mark brainliest ​

Answers

Answer: 10

Step-by-step explanation:

Question A:

The formula to find the hypotenuse is c²=a²+b²

So you would insert the numbers into the formula which would be c²=8²+6²

8²=64

6²=36

36+64=100

So c²=100

Then you want to find c on its own so you have to square root 100.

The square root of 100 is 10.

You have to use this method for the rest of the triangles.

The hypotenuse of the triangles are solved

What is a Triangle?

A triangle is a plane figure or polygon with three sides and three angles.

A Triangle has three vertices and the sum of the interior angles add up to 180°

Let the Triangle be ΔABC , such that

∠A + ∠B + ∠C = 180°

The area of the triangle = ( 1/2 ) x Length x Base

For a right angle triangle

From the Pythagoras Theorem , The hypotenuse² = base² + height²

if a² + b² = c² , it is a right triangle

if a² + b² < c² , it is an obtuse triangle

if a² + b² > c² , it is an acute triangle

Given data ,

Let the triangle be represented as ΔABC

Now , the measure of sides of the triangle are

a)

a = 8

b = 6

Now , From the Pythagoras Theorem , The hypotenuse² = base² + height²

c = √ ( 8 )² + ( 6 )²

c = √100 ≈ 10

b)

a = 11

b = 7

c = √170 ≈ 13.0

c)

a = 13

b = 6

c = √205 ≈ 14.3

Hence , the hypotenuse of the triangles are solved

To learn more about triangles click :

https://brainly.com/question/16739377

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An angle measures 144° less than the measure of a supplementary angle. What is the measure of each angle?

Answers

Answer:

one angle = 162

another = 18

Step-by-step explanation:

one angle = x = 162

another angle = x - 144 = 162 - 144 = 18

x + x - 144 = 180

x + x = 180 + 144

2x = 324

x = 324/ 2 = 162

I hope im  Right!  !!

Suppose g(x) = f(x - 1) - 5. Which statement best compares the graph of
g(x) with the graph of f(x)?

Answers

D is your answer i believe

Step-by-step explanation:

using g(x), -1, which is our change of x will go right. -5 is our change in y, so therefore it goes down. negative means down, positive means up for our change of y. for our change of x, negative goes right, and postive goes left. thats why i think the answer is d

The measures of two angles in a triangle are shown in the diagram.
48°
Which equation can be used to find the value of x?

Answers

Answer:

H is correct

Step-by-step explanation:

The value of x is 1036 because I said so

Write 1.452 × 103 as an ordinary number?

Answers

Answer:

150

Step-by-step explanation:

A radio arm saw has a circular cutting blade with a diameter of 10 inches and it spins at 2000rpm if there are 12 cutting teeth per inch on the cutting blade how many teeth cross the cutting surface each second

Answers

Answer:

12565.11 teeth approximately cut cross the cutting surface per seconds.

Step-by-step explanation:

Since the diameter is 10inches, the circumference of the arm saw is 10π (circumference is πd where d is diameter).

The number of teeth on the cutting blade can be gotten by multiplying the diameter by 12 since we have 12 teeth per inch on the arm saw

Number of teeth on saw = 12 x 10π = 120π.

To get the number of teeth that cross the cutting surface in 2000rpm we multiple it by the total number of teeth in just one rpm.

So we have 2000 x 120π. But since we are asked to find it in revolution per seconds then 2000r/m = 2000r/60s ≈ 33.33

Therefore, we have

33.33 x 120π ≈ 12565.11 teeth

y varies directly as x and inversely as the square of z. y = 65 when x = 80 and z=4. Find y when x= 18 and z=3.

Answers

Answer: y

=

18

Explanation:

As

y

varies directly as

x

, we have

y

x

. Also it varies inversely as square of

z

, which means

y

1

z

2

.

Hence,

y

x

z

2

or

y

=

k

×

x

z

2

, where

k

is a constant.

Now when

x

=

80

and

z

=

4

,

y

=

10

, so

10

=

k

×

80

4

2

=

k

×

80

16

=

5

k

Hence

k

=

10

5

=

2

and

y

=

2

x

z

2

.

So when

x

=

36

and

z

=

2

,

y

=

2

×

36

2

2

=

72

4

=

18

Step-by-step explanation:

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