A text book publisher wants to estimate the number of sentences per paragraph in a history textbook. The publisher count the number of sentences in 150 randomly selected paragraphs. The results are shown in the table. Based on the data what is the mean number of sentences per paragraph in the textbook?
A. 4
B. 5
C. 10
D. 15
Answers
Using the weighed mean, it is found that the mean number of sentences per paragraph in the textbook is given by:
B. 5
What is the weighed mean?The weighed mean is given by the sum of all elements in a data-set multiplied by it's weight, divided by the sum of the weights.
In this problem:
The sum of the values multiplied by it's weights is: 1 x 0 + 2 x 3 + 3 x 20 + 4 x 43 + 5 x 36 + 6 x 25 + 7 x 10 + 8 x 8 + 9 x 2 + 10 x 3 = 750.Considering that there are 150 books, we have the mean is:
M = 750/150 = 5.
Hence option B is correct.
More can be learned about the weighed mean at https://brainly.com/question/24398353
Related Questions
HELP BRAINLIEST TO WHO EVER CAN ANSWER THIS QUICK!!!!!!!
The graph shows a line and two similar triangles.
What is the equation of the line?
y = three-halves x
y = two-thirds x
y = 3 x
y = 2 x
Answers
Answer:
y = two-thirds xStep-by-step explanation:
Corresponding sides should have same ratio:
y/x = 2/3Solve for y:
y = 2/3xCorrect choice is B
PLEASE WHAT IS THE AREA OF THIS HELP ME PLEASE
Answers
Answer:
it should be 14,580 m^2
(the ^2 means squared btw)
A hard-boiled egg is removed from a pot of hot water and set on the table to cool. The rate of change of the egg’s temperature T with respect to time t is proportional to the difference between the egg’s temperature in degrees Fahrenheit ( °F) and the room temperature of 75°F. Which of the following is a differential equation that describes this relationship, where k is a constant?
Answers
Answer:
dT/dt = k(T-75)
Step-by-step explanation:
dT/dt = the rate of change of the egg's temperature T with respect to time t
k = constant
(T-75) = difference between the egg's temperature and the room temperature 75 degree
The relationship between the temperature of the egg and that of the room is dT/dt = k(T-75).
From the Newton's law of cooling, the rate of cooling of any object depends on the temperature difference between the object and the surroundings. This is usually expressed in a differential equation.
In this particular instant, the differential equation that shows the relationship between the temperature of the egg and that of the room is dT/dt = k(T-75).
Learn more about Newton's law of cooling:https://brainly.com/question/15574522
Calculate the total surface area of the cube:
Answers
Answer:
150cm²
Step-by-step explanation:
area of 1 face=5*5=25cm²
A cube has 6 faces so you have to find the area of 6 faces to find complete surface area.
If 1 face = 25cm²
6 faces =25cm² x 6
=150cm²
Plsssss make me BRAINLIEST
Yesterday the temperature was 11 degrees Celsius. Today the temperature is O degrees Celsius What is the change in temperature from yesterday to today?
Answers
Answer: 11 degrees Celsius
Step-by-step explanation:
hey yall one more
y-(-99)=4
find x please
Answers
Answer:
67766788786686
Step-by-step explanation:
86686868686867
Answer:
-95
Step-by-step explanation:
HELP PLEASE I WILL GIVE YOU BRAINLIEST!!!
Answers
Hope it helpssssssssssssssssss
This is the whole picture can someone help??
Answers
Step-by-step explanation:
I can't see good the picture
40 PONITS TO THE PERSON WITH CORRECT AWNSER.
Answers
Answer:
B= 10k+6
Step-by-step explanation:
adding like terms!
3k+3k+2k+2k= 10k
4+4-1-1=6
Answer:
Hmmmmmm
Step-by-step explanation:
PLEASE HELL ME BECAUSE I DONT UNDERSTAND
Answers
Answer:
B. 5/3
Step-by-step explanation:
Take out the fourth root by doing 20/4 = 5. Then take out the third root by doing 5/3 so your answer is 5/3
Answer:
Answer = 5/3
Step-by-step explanation:
We simplify the squareroot to become ((x-5)^20)^1/12. Simplifying this further will get us (x-5)^5/3. We know that "b" is the exponent on (x-5), therefore the answer is 5/3.
which of the following quadrilaterals have diagonals that are always perpendicular to each other?
Answers
Answer:
Square and Rhombas
Step-by-step explanation:
Answer:
square, rhombus
Step-by-step explanation:
A P E X
How do I calculate volume
Answers
Answer:
Volume = length x width x height.
You only need to know one side to figure out the volume of a cube.
The units of measure for volume are cubic units.
Volume is in three-dimensions.
You can multiply the sides in any order.
Which side you call length, width, or height doesn't matter.
Which fraction are equivalent to 4/9
Answers
Answer:
4/9 8/18 36/81
Step-by-step explanation:
<(￣︶￣)>
find the ratio of 15minutes and 1hour
Answers
Answer:
4 : 1
Step-by-step explanation:
1 hour : 15 minutes
However we cannot write like this since they aren't of the same unit, so you can either change the minutes to hour by dividing it with 60 or change the hours to minutes by multiplying it with 60.
1 hour = 60 minutes
60 : 15
The ratio can be simplified.
12 : 3 ( 60 and 15 are multiples of 5 )
The ratio can again be simplified further.
4 : 1 ( 12 and 3 are multiples of 2 )
please help
answer fast if possible
Answers
Hope This Helps
The model represents the factorization of 2x2+5x+3.
What are the factors of the polynomial?
Answers
Answer:
(2x+3)(x+1)
Step-by-step explanation:
which shape is not a trapezoid
Answers
Answer:
trapezium
If the shape you're looking at doesn't have at least one set of parallel sides, it's not a trapezoid; it's something called a trapezium instead. Similarly, if the shape has two sets of parallel sides, it's not a trapezoid. It's either a rectangle, a parallelogram shape or a rhombus.
Step-by-step explanation:
2) Christmas is on its way, so the price of a box of Thornton's chocolates has been increased
by 15%!! A box of Thornton's Continental now costs £17.25. How much did it cost
originally?
Answers
Our regular cost of chocolates is 1.0
New cost is 1.0 + 0.15 = 1.15
1.15 x 17.25 = 19.8375
In the states we round to the hundredth for cost, so it would be £19.84
Alternate method: calculate 0.15 of 17.25 and add that to 17.25
0.15 x 17.25 = 2.5875
17.25 + 2.5875 = 19.8375
what is the solution to these equations y= 2x +1 and x +2y= 27
Answers
Answer:
The first one is -1/2
the second one is x+2y-27=0
Bobbie invested $140 from her birthday money. She earned a simple interest of 3% per year on
her investment. What was the amount of interest Bobbie received at the end of two years?
Answers
Answer:
bobbie recieved the interest of $8.40 per year
Step-by-step explanation:
140 x .03 = $4.20
$4.20 per year
2 x 4.20 = 8.40
Use the diagram to find the missing measures.
The measure of angle GHE is
62
°.
The length of GE is
.
Answers
Answer:
62
15
Step-by-step explanation:
sorry i’m a bit late
Answer:62
And 15
Step-by-step explanation:
Yea its good :)
Find the area of the shaded region. Round to the nearest hundredth when necessary.
Answers
Answer:
Area of the shaded region is 223.72 square units.
Step-by-step explanation:
Area of the shaded region = Area of parallelogram - Area of triangle
Area of the parallelogram = base x height
= 23.8 x 15
= 357 square feet
Area of triangle = [tex]\frac{1}{2}[/tex] x base x height
Let the height of the triangle be represented by h, applying the Pythagoras theorem;
[tex]23.8^{2}[/tex] = [tex]21^{2}[/tex] + [tex]h^{2}[/tex]
566.44 = 441 + [tex]h^{2}[/tex]
[tex]h^{2}[/tex] = 125.44
h = [tex]\sqrt{125.44}[/tex]
= 11.2
h = 11.2
Area of the triangle = [tex]\frac{1}{2}[/tex] x 23.8 x 11.2
= 133.28
Area of shaded region = 357 - 133.28
= 223.72
Area of the shaded region is 223.72 square units.
What is the next number in the sequence 3, -6, 12 -24
Answers
Answer:
48
Step-by-step explanation:
3 × -2 = -6
-6 × -2= 12
.......
TIME REMAINING
51:12
Mrs. Liang, the librarian, wants to compare the numbers of patrons who prefer e-books to paperback books. She decides
to take a poll of every third adult with a child who arrives at the library for one of the four reading groups: toddlers,
preschoolers, primary grades, and upper elementary. Which statement is true about her method of data collection?
It is balanced because she is including parents with children of all ages so she will get a greater age range.
It is not balanced because it is less likely to include teens, young adults, and senior citizens in the patron population.
It is not balanced because she only surveyed the adults and not the young children.
It is balanced because she is polling four different reading groups, which include all types of people.
See
Answers
Answer: It's not balanced because it's less likely to include teens, young adults, and senior citizens in the patron population.
Step-by-step explanation: If wants to get a good sample for the whole "population," she should've taken broader samples of people of all ages.
Answer:
I think it is B .................
Step-by-step explanation:
At work, there are 5 females for every 4 males. If there are 372 males, then how many females are there?
Answers
Answer:
If the ratio is 5 to 4, then there are 5 men in a group of 9 people. 63/9 is 7, so you have 7 groups of 9 people
There would be 465 females sorry if I am wrong I am really tired.
Help I don’t understand
Answers
Answer:
for every 4 strikes thrown, there were 1 balls thrown
plzzzzzzz solve the pic
Answers
Answer:
40 sq units
Step-by-step explanation:
It is made by multiple right triangles
5 x 4 = 20
20 / 2 = 10
so now we multiply by 4
10x4 = 40
40 sq units
Vashti and Stacy measure the width of the gym at their school. It is 17 yards wide.
[Hint: There are 36 inches in 1 yard.]
Part A
column first. Vashti writes the partial
3 by the tens column first.
Stacy is finding the width of the gym, in inches, by adding the partial products of
17 x 36. She finds three of the partial products. Which statement explains
the partial product Stacy is missing?
Which explanation correctly describe
the same or different?
Width of the gym = 42 + 60 + 300+?
Stacy and Vashti's products w
products can be added in any
Stacy is missing the partial product, 21, because she still needs to find
3 ones x 7 ones.
Stacy and Vashti's products we
products have to be multiplied
factors in the wrong order, so s
Vashti.
Stacy is missing the partial product, 210, because she still needs to
find 3 tens x 7 ones.
Stacy is missing the partial product, 600, because she still needs to
find 6 tens x 1 ten
Stacy and Vashti's products wo
products have to be multiplied f
factors in the wrong order, sos!
Stacy
3
5
Answers
find the unit rate and show work
289 miles on 10 gallons
Answers
Answer:
28.9 miles per gallon
Step-by-step explanation:
unit rate is usually something per something. Like miles per hour. In this case we have mile per gallon. MPG.
Unit rate is basically A number X per 1 of something.
so in this cares X per gallon.
we want 10 gallons to go to 1 gallon. So we divide by 10 to get to 1. But if we divide by 10 on one side, we have to do it to the other side. so 289/10=28.9
so our final answer is:
28.9 miles per gallon
What is 4 superscript 5 written in expanded form?
4 + 4 + 4 + 4 + 4
4 times 4 times 4 times 4 times 4
5 + 5 + 5 + 5
5 times 5 times 5 times 5
Answers
Answer:
4 times 4 times 4 times 4 times 4
Step-by-step explanation:
4 is the base number and you have to times the base number 5 times
Answer:
The person above me ^^ Is correct! The answer is B :) GL!!!
Step-by-step explanation: