Mathematics College

The manager of a supermarket records the waiting times of 100 customers.
He wishes to calculate an estimate for the mean waiting time.
He draws this table.
Waiting Time
Number of
Midpoint (x)
fx
(minutes)
customers (0)
0-
0.5
5
2.5
1 -
1.5
28
42
2 -
2.5
32
80
3.5
26
91
3-
4-5
4.5
9
40.5
100
256
a) Complete the table.
b) Calculate an estimate for the mean. (I JUST NEED HELP ON B)

Answers

Answer 1

Answer:

2.56

Step-by-step explanation:

you add all the columns up to get an answer of 256 and divide it by 100=2.56

Answer 2

Answer:

2.4

Step-by-step explanation:

Related Questions

Find the measure of the missing angle.
а
54°

Answers

Answer:

a = 36°

Step-by-step explanation:

a + 54° = 90°

a = 90° - 54°

a = 36°

What do two equivalent expressions ALWAYS have in common?

A: The same value
B: The same variables
C: The same constant
D: Both have a equal

Answers

It’s c the same constant. Have a nice day!

Find the missing side of each triangle.
1)
15 m
9 m
A) 19 m
C) 8 m
B) 17 m
D) 12 m

Answers

Answer:

Step-by-step explanation:

it is because its a even number XD

Cesar bought 20 boxes of pizza and gave 14 nosed away what percentage is left

Answers

Answer:

30%

Step-by-step explanation:

14/20 is 70% he gave away, so 30% is left.

Answer:

30%

Step-by-step explanation:

I hope this helps :)

If you use 104 kiloliters of water per year, approximately how many liters of water do you use in a day?

2,000 liters
0.28 liters
285 liters
85 liters

Answers

Answer: 285 liters

Explanation: I did 104,000 divided by 365 on a calculator and it gave me 285

pls pls pls pls help, i will mark brainliest

Answers

Answer:

B) 81°

Step-by-step explanation:

∡1 ≅ ∡5 because they are corresponding angles

∡5 ≅ ∡7 because they are vertical angles

therefore, ∡1 ≅ ∡7

since the angles are equal we can create the following equation:

3x + 18 = 2x + 39

x + 18 = 39

x = 21

∡7 = 2(21) + 39

∡7 = 42 + 39

∡7 = 81

Plz help!!!!
With this question

Answers

Answer:

GH = 15

Step-by-step explanation:

14. BC = 19

GH = 9x - 3

FE = 5x + 1

Given that GH is the midsegment of the trapezoid, therefore:

GH = (BC + FE)/2

Plug in the values

9x - 3 = (19 + 5x + 1)/2

9x - 3 = (20 + 5x)/2

Multiply both sides by 2

2(9x - 3) = 20 + 5x

18x - 6 = 20 + 5x

18x - 5x = 20 + 6

13x = 26

Divide both sides by 13

x = 2

✔️GH = 9x - 3

Plug in the value of x

GH = 9(2) - 3 = 18 - 3

GH = 15

Martina is 3 inches less than twice as tall as her little brother.

In the space below, write an expression for Martina’s height. Then, use the expression to find Martina's height if her little brother is 28 inches tall.
Help ASAP

Answers

Answer:

m=2x-3

Step-by-step explanation:

2(28)-3

56-3

53 inches

What is 240 more than 100

Answers

Answer:

340

Step-by-step explanation:

240 + 100 = 340

We are looking for a new number which is 240 more than 100.
We will get the new number by adding 240 to 100.
We write it down as:
100+240=340 so the answer is 340

The table shows the approximate diameters of four bacteria cells.
Bacteria Cell Diameters
Cell
Diameter
(meters)
w
0.0000029
х
0.000000024
Y
0.00002
N
0.00000027
Which list shows the bacteria cells in order from least to greatest diameter?

Answers

Answer:

Step-by-step explanation:

It’s b I think

What is the value of the expression 7x (5-3) + (100 ÷ 5)

Answers

Answer:

Step-by-step explanation:

4) The length of a rectangle is 7 inches more than the width. The perimeter of the rectangle
is 178 inches. Find the width of the rectangle.

Answers

Answer:

41 inches

please mark brainliest

Step-by-step explanation:

l= 7+w

perimeter = 2(l+w) =2(7+w +w)= 2(7+2w)= 14+ 4w

178= 14+4w

4w =178-14= 164

w= 164/4 = 41 inches

Write the equation 12 = -3x + 6 in the form ax + b = c, with c = 12. What are the values of a and b?

Answers

sorry I don't know Ab = cd and bc = ad

Using SAS postulate triangles formed by ABC = abd

Opposite sides are equal and each angle is 90 degrees so by definition it is a rectangle.Ab = cd and bc = ad

Using SAS postulate triangles formed by ABC = abd

Opposite sides are equal and each angle is 90 degrees so by definition it is a rectangle.

Answer:

I think the answer is .

Step-by-step explanation:

C= 12

Hope this helps

Which is equivalent to the expression below? |-3|
O
13
-1-31
O
3

Answers

it’s 3, absolute value makes everything positive

answer is 3 because absolute value is always positive

The measure of Angle D is
degrees.
O=41 degrees

Answers

Answer:

49°

Step-by-step explanation:

O=41° and G=90° (because it is a right angle). The sum of the interior angles of a triangle is 180°. So, add the known angles, 41°+90°=131°. Since the sum of all three angles needs to be 180°, subtract the known angles from the total, 180°-131°=49°, to find the unknown angle.

The angle D in triangle OGD measures 49 degrees.

To find the measure of angle D in triangle OGD, we can use the fact that the sum of the angles in a triangle is always 180 degrees.

Given that angle O is 41 degrees and angle G is 90 degrees, we can substitute these values into the equation:

Angle O + Angle G + Angle D = 180

41 + 90 + Angle D = 180

131 + Angle D = 180

Now, we can solve for angle D by subtracting 131 from both sides:

Angle D = 180 - 131

Angle D = 49

Therefore, angle D in triangle OGD measures 49 degrees.

To know more about triangle:

https://brainly.com/question/2773823

#SPJ6

Is height always a statistical subject

Answers

Answer:

It Is!

Step-by-step explanation:

"For example, “How old am I?” is not a statistical question, but “How old are the students in my school?” is a statistical question because one anticipates variability in students' ages."

Add 3/10+ 33/100+ 1+ 7/10 ( in fraction form) (this is 4th grade not middle school) please help

Answers

Step-by-step explanation:

Please refer to the attachment

Find the slope and y-intercept of equation y= 10x + 18

Answers

Answer:

slope is 10

y-intercept is 18

Step-by-step explanation:

The slope and y-intercept in y = 10x + 18 are 10 and 18 respectively.

What are lines and their slopes?

We know lines have various types of equations, the general type is

Ax + By + c = 0, and the equation of a line in slope-intercept form is

y = mx + b.

Where slope = m and b = y-intercept.

the slope is the rate of change of the y-axis with respect to the x-axis and the y-intercept is the (0,b) where the line intersects the y-axis at x = 0.

Given a line in slope-intercept form which is y = 10x + 18.

We know in y = mx + b, slope = m, and y-intercept = b.

∴ In y = 10x + 18.

Slope = 10 and y-intercept = 18.

learn more about lines and slopes here :

https://brainly.com/question/3605446

#SPJ5

12x + 2y = 6

A. solve for y

B. What is the slope and what is the y-intercept?

Answers

Answer:

y=3

B.Slope is -6 Y intercept is 0.5

Step-by-step explanation:

Mila bought a computer with a price tag of $1,200.
After tax the total was $1,284. What was the rate of the
tax?

Answers

Answer: 7%

Step-by-step explanation:

Find the area of a square
with a side length of 3/4

Answers

Answer:

area of square

= side × side

= 3/4 ×3/4

=9/16

y = - 2x + 1
2x - 2y = 4
Solve systems of equations by substitutions

Answers

Answer:

x= 1

y= -1

Step-by-step explanation:

y=-2x+1

2x-2y=4

substitute for y

2x-2(-2x+1)=4

reduce

2x+4x-2=4

6x=6

x=1

y= -2(1)+1

y= -1

I really need help quickly please!!!!

Answers

Answer:The third one is!!

Step-by-step explanation:

The commutative property of addition says that changing the order of addends does not change the sum. Here's an example: 4 + 2 = 2 + 4 4 + 2 = 2 + 4 4+2=2+4

Yup absolutely right nice one

What is the sum of 5/7 + 5/6?

A. 10/42

B. 10/13

C. 1 & 23/42

D. 6 & 5/42

Answers

Answer:

C. 1 & 23/42

Step-by-step explanation:

Well when we add it we get 65/42 and we need to

simplify it and we get 1 & 23/42.

Answer:

Step-by-step explanation:

HELP PLEASEEEEE PLEASE HELP

Answers

Answer:

What do you need help with?

Step-by-step explanation:

"Everyone has a financial plan, but not everyone has financial goals." Explain what you think this

Answers

Answer:

Everyone has financial a plan, but not everyone knows what to do to make the plan work. Planning is different from putting it into action.

What ordered pair would be located 2 units up on the y-axis?
Write answer (x,y);
10
9
8
2
0
5
7 8 9 10

Answers

(0,2) that is if you are starting from zero.

3r^2 if r = 1/6 can someone help me please.

Answers

Answer:

Step-by-step explanation:

Answer:

f = 1/18ir^3

Step-by-step explanation:

Let's solve for f.

3r2ifr=1/6

Step 1: Divide both sides by 3ir^3.

3fir3/3ir3 =1/6/3ir3

f=1/18ir3

HELP ME!
Write an equation where a number is added to a variable, and a solution is -8.

Write an equation where a number is multiplied by a variable, and a solution is - 4/5 (negative four fifths)

also dont answer if you don't know

Answers

Let the variable be x

A number isn’t given so pick any number.

Let’s use 10

Set up the equation to get:

X + 10 = -8

Solve for the variable by subtracting 10 from both sides:

X = -18

Let the variable be y and pick any number, let’s use the number 2.

Equation: 2 x y = 4/5

Solve for y by dividing both sides by 2:

Y = 2/5

Does anyone know wha this could be

Answers

The complex conjugate of 5-4i is 5+4i

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