On a quiz there are four multiple-choice questions worth 3 points each and two true/false questions
worth 1 point each. Each multiple-choice question has five possible choices. If a student randomly
guesses on each question, what is the expected value of the student's score on the test?
2.8
5.4
3.4
1.8
Can anyone help me ples?
Answers
Answer:
3.4
Step-by-step explanation:
Answer:
3.4
Step-by-step explanation:
Since we have given that
Number of multiple choice question = 4
Number of true false questions = 2
Number of points for each multiple choice question = 3
Number of points for each true false question = 1
Number of choices in multiple choice = 5
Probability of getting correct answer in multiple choice question = 1/5
Probability of getting correct answer in true false question = 1/2
answer would be 17/5 which is equal to 3.4
Related Questions
i need to get this right please help
Answers
Answer:
3 x 6
Step-by-step explanation:
Its asking, how did Koda get this answer.
Think about it, on the left u have 3 outside and on top you have 6 outside connect those 2 and you get 18 as your answer.
Don't get confused its just showing step by step on how you can do it and why.
at math
Seventh grade
S.6 Solve one-step equations
Solve for u.
u + 32 = 812
u =
Answers
Answer: 780
Step-by-step explanation:
812-32=780
so u = 780
Please Hurry. I need this answer quickly please.
Answers
Answer:63
Step-by-step explanation:
multiply 72 by 7 then divide i by 8
(72×7)/8
=63
It's 63.
simplify the equation 7/8×72 multiple 7×9 solution is 63
can someone help me with this question
Answers
9514 1404 393
Answer:
28 square units
Step-by-step explanation:
The figure can be decomposed several ways. Maybe easiest to see is as a 8×4 rectangle with a 2×4 right triangle cut from the corner.
The area of the rectangle is ...
A = LW = (8)(4) = 32
The area of the missing triangle is ...
A = 1/2bh = 1/2(2)(4) = 4
Then the area of the shaded figure is ...
32 - 4 = 28 . . . square units
_____
Alternate solution
If you divide the figure with a horizontal line across the middle, it becomes a 4×4 square and a trapezoid with bases 2 and 4 and height 4. The shaded area is the sum of these areas.
The area of a trapezoid is ...
A = 1/2(b1 +b2)h
A = (1/2)(2 +4)(4) = 12
The area of the square is ...
A = s² = 4² = 16
Then the total area is ...
12 +16 = 28 . . . square units
The expression 2(a+b)=−8.1 for certain values of a and b. Find the value of the following expressions for the same values of a and b: −0.5(a+b)
Answers
Answer:
Interpreting as: 2(a+b)=-8.1
Input:
2 (a + b) = -8.1
In Given the expression
2( a + b) = 8.1 ..........................(1)
now divide both sides of the first equation by 2 ,
2 (a + b) /2 = 8.1 /2
(a + b) = 4.05
expression -0.5(a + b) ................(2)
simply put the value of (a + b) in (2),
- 0. 5( 4.05) = -0.5 * 4.05
= 2.025
Value of expression is 2.025.
What is a expression in maths?
An expression is a set of terms combined using the operations +, – , x .
For example - 4 x − 3 or x 2 – x y + 17 .
Learn more about https://brainly.com/question/24242989
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1.A car consumes 5 liters of gasoline for every 100 kilometers it travels.
a)Find the constant of proportionality.
b)Represents the number of liters of gasoline consumed (y) after "x" kilometers
c)How many liters of gasoline does he need to travel 1250 kilometers?
Answers
Answer:
62.5 Liters of gasoline
Step-by-step explanation:
1250/100=12.5
12.5 x 5 = 62.5
20 Kilometers per gallon
1:20
1250/20=#of gallons
62.5 gallons
whats the surface area?
Answers
Answer:
1108 in²
Step-by-step explanation:
You want the total surface area of the pentagonal prism shown.
Base areaThe area of each of the two pentagonal bases is the sum of the area of the yellow rectangle and the area of the triangle above it. That sum is ...
A = LW +1/2bh
A = 5(12) +1/2(12)(9) = 12(5 +9/2) = 114 . . . . square inches
Lateral areaThe lateral area of the prism is the sum of the areas of the 5 rectangles. That sum will be the product of the perimeter of the pentagonal base and the distance between bases.
LA = (12 +5 +11 +11 +5)(20) = (44)(20) = 880 . . . . square inches
Total areaThe total surface area of the figure is the sum of the two base areas and the lateral area:
SA = 2(114 in²) +880 in² = 1108 in²
The surface area of the composite figure is 1108 in².
<95141404393>
Which of the following postulates led to the discovery of non Euclidean geometry?
A. A straight line segment can be drawn between any two points.
B. Through a given point not on a given line, there is exactly one line
parallel to the given line.
C. All right angles are equal to one another.
D. Any straight line segment can be extended indefinitely.
Answers
The discovery of non-Euclidean geometry will be All right angles are equal to one another. Then the correct option is C.
What is Geometry?It deals with the size of geometry, region, and density of the different forms both 2D and 3D.
The discovery of non-Euclidean geometry will be
The straight line segment can be drawn between any two points.Through a given point not on a given line, there is exactly one line parallel to the given line.Any straight line segment can be extended indefinitely.Then the correct option is C.
More about the geometry link is given below.
https://brainly.com/question/7558603
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Three girls on a high school track-and-field team practiced the shot put. Each girl made 10 attempts, and the distances measured after each attempt are shown on the line plots. Which girl's range of distances was the greatest? HELP
Answers
Answer: Sara
Step-by-step explanation:
Sara had the most because most of her plot points are in the highest
area
What If? The rules for multiplying two integers can be extended to a product of 3 or more integers. Find the following products by using the Associative Property to multiply 2 numbers at a time. a. 3(3)(–3) b. 3(–3)(–3 ) c. –3(–3)(–3 ) d. 3(3)(3)(–3 ) e. 3(3)(–3)(–3) f. 3(–3)(–3)(–3)
Answers
Answer:
Your answer is:
A= -27
B= 27
C= -27
D= -81
E= 81
F= -81
Step-by-step explanation:
Hope this helped : )
Can someone please help me with this math sentence?
Answers
$108
Step-by-step explanation:
If 48 hats costs $192;
Then 1 hats would cost $4.
So therefore 27 hats would cost $108 i.e. 27 times $4
Use the best-fit line below to predict the value of y when x = 7
Answers
Answer:
the answer is 6 because when x=7 on the line it is also equal to 6 on the y axis
Angles A and B are corresponding angles. The measure of A is 135°. What is the measure of B?
A. mB = 45°
B. mB = 90°
C. mB = 125°
D. mB = 135°
Answers
Therefore, the answer is D. mB = 135°.
Answer: hope this helps ♡
D. mB = 135°
Step-by-step explanation:
mA = 135°
mB = 135°
(most corresponding angles are equal)
100 students are interviewed to see which of biology, chemistry or physics they prefer.57 of the students are girls. 34 of the girls like biology best.27 of the boys prefer physics.20 out of the 28 who prefer chemistry are girls.What percentage of the students prefer biology?
Answers
Answer:
42%
Step-by-step explanation:
I think it's 42% because out of the 57 girls 34 prefer biology,20 prefer chemistry then it means the remaining 3 prefer physics. There's 43 boys, 8 prefer chemistry,27 prefer physics which leaves us with 8 boys who maybe prefer biology. Therefore:
(34+8)÷100×100 = 42%
HELP ASPA
A parallelogram-shaped tapestry has a base of 6 feet and a height of 5 feet.
Explain how you would find the area of the tapestry. What is the area?
Answers
Answer:
The answer is 30 ft²
Step-by-step explanation:
To find the area, you will use the formula A = bh. This formula is for a parallelogram and a rectangle.
Base = 6 ft
Heigh = 5 ft
6 ft × 5 ft = 30 ft²
Answer:
6*5=30 ft²
Step-by-step explanation:
can i have brainliest
The stem-and-leaf plot displays data collected on the size of 15 classes at two different schools.
Mountain View School Seaside School
0 5, 8
9, 8, 2, 0 1 0, 1, 2, 5, 6, 8
8, 7, 6, 5, 5, 4, 4, 3, 1, 0 2 5, 5, 7, 7, 8
0 3 0, 6
Key: 2 | 1 | 0 means 12 for Mountain View and 10 for Seaside
Part A: Calculate the measures of center. Show all work. (2 points)
Part B: Calculate the measures of variability. Show all work. (1 point)
Part C: If you are interested in a smaller class size, which school is a better choice for you? Explain your reasoning. (1 point)
Answers
For Mountain View School:
Data: 0, 0, 0, 0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 6, 7, 8, 8, 8, 9
Mean: (0 + 0 + 0 + 0 + 1 + 2 + 3 + 4 + 4 + 5 + 5 + 5 + 5 + 6 + 7 + 8 + 8 + 8 + 9) / 19
= 100 / 19
≈ 5.26
To find the median, we need to arrange the data in ascending order: 0, 0, 0, 0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 6, 7, 8, 8, 8, 9.
The median is the middle value, which is the 10th value in this case.
Median: 5
For Seaside School:
Data: 0, 0, 0, 1, 1, 2, 2, 4, 5, 5, 5, 5, 6, 7, 7, 8, 8, 8, 9
Mean: (0 + 0 + 0 + 1 + 1 + 2 + 2 + 4 + 5 + 5 + 5 + 5 + 6 + 7 + 7 + 8 + 8 + 8 + 9) / 19
= 80 / 19
≈ 4.21
To find the median, we need to arrange the data in ascending order: 0, 0, 0, 1, 1, 2, 2, 4, 5, 5, 5, 5, 6, 7, 7, 8, 8, 8, 9.
The median is the middle value, which is the 10th value in this case.
Median: 5
Now let's calculate the measures of variability, specifically the range and interquartile range (IQR).
Range: The range is the difference between the largest and smallest values in the dataset.
For Mountain View School:
Range: 9 - 0 = 9
For Seaside School:
Range: 9 - 0 = 9
Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1) and measures the spread of the middle 50% of the data.
For Mountain View School:
Q1 = 3
Q3 = 7
IQR = Q3 - Q1 = 7 - 3 = 4
For Seaside School:
Q1 = 2
Q3 = 7
IQR = Q3 - Q1 = 7 - 2 = 5
To determine which school is a better choice for a smaller class size, we can consider both the mean and the median.
Both the mean and median for Mountain View School are higher than those for Seaside School. This suggests that, on average, the class sizes at Mountain View School are larger than those at Seaside School. Therefore, if you are interested in a smaller class size, Seaside School would be a better choice
For Mountain View School:
- Median: The median class size is the middle value, which is 25.
- Mean: The mean class size is the sum of all the class sizes divided by the total number of classes, which is (29 + 28 + 28 + 27 + 25 + 24 + 24 + 23 + 21 + 20 + 19 + 18 + 15 + 13 + 10) / 15 = 21.27.
For Seaside School:
- Median: The median class size is the middle value, which is 20.
- Mean: The mean class size is the sum of all the class sizes divided by the total number of classes, which is (25 + 25 + 27 + 27 + 28 + 28 + 28 + 30 + 31 + 35 + 36 + 38 + 40 + 43 + 45) / 15 = 31.13.
Part B:
For Mountain View School:
- Range: The range is the difference between the largest and smallest values, which is 29 - 10 = 19.
- Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1). From the stem-and-leaf plot, we can see that Q1 is 20 and Q3 is 28. Therefore, the IQR is 28 - 20 = 8.
For Seaside School:
- Range: The range is the difference between the largest and smallest values, which is 45 - 25 = 20.
- Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1). From the stem-and-leaf plot, we can see that Q1 is 27 and Q3 is 38. Therefore, the IQR is 38 - 27 = 11.
Part C:
If you are interested in a smaller class size, Mountain View School is a better choice for you because it has a lower mean and median class size than Seaside School.
please help!!! The cost of a car rental is $30 per day plus 23¢ per mile. You are on a daily budget of $76. Write and
solve an inequality to find the greatest distance you can drive each day while staying within your
budget. Use pencil and paper. Find 2 other two-step inequalities with the same solutions.
Thank you in advance!!
Answers
Answer:
30+.23x=76
.23x=76-30
.23x=46
x=46/.23
x=200 miles is the mileage limit for $200.
Step-by-step explanation:
hope it helps
Numbers and Operations KA 8th grade- correct answers only ty, and have a great day folks (7 pts)
Answers
Answer:c
Step-by-step explanation:
Answer:
it's c
Step-by-step explanation:
khan academy
ABC is a right triangle with vertices B (9, 4) and C (3, 9).
What are the coordinates of vertex A?
Enter your answers in the boxes.
Answers
Answer:
A (3, 4)
Step-by-step explanation:
A has to be positioned horizontally along B. This means its x coordinate is the same as x-coordinate of B which is 4
A also has to be positioned vertically below C. This means its y coordinate is the same as the y-coordinate of C. So y-coordinate of A is 3
So coordinates of A are (3, 4)
please dont answer if your not sure
Answers
Answer:
AC 4x + 16
Angle BEC is 72 degrees
Step-by-step explanation:
AE is 2x + 8, and AC is 2 times bigger, so 4x + 16
Angle EAD is the same as angle EDA, which is 54 degrees, a triangle has 3 sides measuring 180 degrees total, 54 + 54 = 108, so the last angle is 180 - 108 = 72, angle AED is 72, since angle BEC is the same as angle AED, it is also 72 degrees
Which choice when added to | −5 + 7 | will equal zero?
| +5 − 7 | [ 2] − | −5 + 7 | [3] | −( −5 + 7 ) | [4] | 7 − 5 |
i know the anwser is two but how do you get it
i need it by 5/1/23 at 8pm
Answers
Answer:
[ 2] − | −5 + 7 |
Step-by-step explanation:
Since we know that | −5 + 7 | is an absolute value, we know that the answer will be positive no matter what.
Step 1) Solve. | −5 + 7 | = 2.
Step 2) Find which other absolute value is equal to -2.
After solving [2], − | −5 + 7 | = -2, we know that the answer is choice 2.
We know this because | −5 + 7 | = 2, however, since it is multiplied by (-), it becomes -2. And 2 + (-2) = 0
We start by simplifying | −5 + 7 |:
| −5 + 7 | = | 2 | = 2
Now we can simplify each of the answer choices:
[2] | +5 − 7 | = | −2 | = 2
[3] | −( −5 + 7 ) | = | 2 | = 2
[4] | 7 − 5 | = | 2 | = 2
We see that only choice [2], when added to | −5 + 7 |, will equal zero:
2 + (−2) = 0
Therefore, the answer is [2] | +5 − 7 |.
help mee asap pleasee Which expression calculates the speed in feet per second of an object that travels a distance of 20 feet every 4 seconds?
Responses
A-20 plus 4
B-4 times 20
C-20 divided by 4
D-4 divided by 20
Answers
Answer:
C
Step-by-step explanation:
C
Step-by-step:
d: 20
t: 4
d= v • t
20 = 4v
20/4
3.5 , 1 , -7 , 13 , 9/6
List the numbers in descending order:
Answers
Explanation: the numbers are written in descending order which means from highest to lowest number.
Answer:
13, 3.5, 9/6, 1, -7
Step-by-step explanation:
Please find the:
2/5 of 2/3
Answers
Answer:
4/15 is what I got :)
Step-by-step explanation:
2/ 5 * 2/ 3 = 2 · 2/ 5 · 3 = 4/ 15
sorry for the weird formatting but thats all brainly will take (:
Scott and Mark are rock climbing. Scott is at the top of a -foot cliff, when he throws a -foot rope down to Mark, who is on the ground below. If the rope is stretched tightly from Mark’s feet to Scott’s feet, how far from the base of the cliff (directly below Scott) is Mark standing? Draw a diagram and label it. Then find the missing length. Is the length irrational?
Answers
Answer:
hope this helps ;)
Keira said that if 6 tickets are sold, there should be 2 tickets left. Is Keira correct?
Answers
According to Keira, if 6 tickets are sold, there should be 2 tickets left. However, we don't have any information about the initial number of tickets available.
If the total number of tickets initially was 8, and 6 tickets were sold, then there would indeed be 2 tickets left, supporting Keira's statement.
However, if the total number of tickets initially was less than 8, or if the statement doesn't specify the initial number of tickets, we cannot determine if Keira's statement is correct.
Therefore, without additional information, we cannot determine the accuracy of Keira's statement.
A project will take a total of 720 person-days to complete. If the project must be completed in 30 days, how many people must be employed? PLEASE HURRY
Answers
Answer:
192 hours per day / 8 hours per person per day = 24 people
Step-by-step explanation:
Assuming each person works for 8 hours a day, the total number of hours needed to complete the project is:
720 person-days x 8 hours = 5,760 hours
To complete the project in 30 days, the total number of hours needed per day is:
5,760 hours / 30 days = 192 hours per day
Sorry for the bad quality but Plsss help
Answers
using the ordered pairs (x, y) in the table
what is the proportionality constant or the rate of change?
Answers
mean median mode
4, 7, 10, 7, 14, 6, 0, 2, 9, 5, 3, 4
Answers
median- 6
mode- 7
i think :)