Volunteer/voluntary response bias, also known as self-selection bias, occurs when research participants exert control over the decision to engage in the study.
What is Probability?The ratio of good outcomes to all possible outcomes of an event is known as the probability. The number of positive results for an experiment with 'n' outcomes can be represented by the symbol x.
The probability of an event can be calculated using the following formula.
Probability(Event) = Positive Results/Total Results = x/n
In order to better grasp probability, let's look at a straightforward application.
Let's say we need to forecast if it will rain or not. Either "Yes" or "No" is the appropriate response to this query.
There is a chance that it will rain or not. Here, probability can be used. Using probability, one may forecast the results of a coin toss, a roll of the dice, or a card draw.
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mr. bell gave out a science test last week to six honors students. the scores were 88, 94, 80, 79, 74, and 83. what is the standard deviation of the scores?
The standard deviation of the scores is 6.48
For given set of scores, 88, 94, 80, 79, 74, and 83
Here, the number of observations = 6
The mean of the scores would be,
μ = Σx/n
μ = (88 + 94 + 80 + 79 + 74 + 83)/6
μ = 498/6
μ = 83
Using the formula of standard deviation,
σ = √((Xi−μ)^2)/n
σ = √[(88 - 83)² + (94 - 83)² + (80 - 83)² + (79 - 83)² + (74 - 83)² + (83 - 83)²]/6
σ = √(252/6)
σ = √42
σ = 6.48
Therefore, the standard deviation = 6.48
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Evaluate 23x-1 for x = 1.
2 to the power of 3 not 23
Answer: = 7 i believe
Step-by-step explanation:
2^3 (2 power by 3) x - 1 for 1 which is 7
PLS HELP ASAP WILL NAME BRAINLIEST
what is a product of -30 but the sum of -1
Answer: -6 and 5
Step-by-step explanation:
-6 and 5
x+y = -1
xy = -30
x=-1-y
y(-1-y)=-30
-y^2-y=-30
-y^2-y+30=0
(y-5)(5+6)
y=5,-6
Rose spent $2.00 for
20 pieces of gum. Joe spent
$1.50 for 10 pieces of gum.
Who got the better deal?
Explain your answer.
Answer: Rose got the better deal!
Step-by-step explanation:
Rose got the better deal, she only spent .10 cents for every piece, while joe spent .15 cents and only got 10 pieces.
A city has 3 new houses for every 7 old houses. If there are 21 new houses in the city, how many old houses are there?
A.
52
B.
49
C.
51
D.
47
Answer:
B. 49
Step-by-step explanation:
21/3 = 7 new houses
7*7 = 49 old houses
Answer:
Answer to the question is B: 49
The reciprocal of x^3
Answer:
x^-3
Step-by-step explanation:
The reciprocal of x^3 is x to the power of negative 3 (aka [tex]\frac{1}{x^3}[/tex]).
m% of p% of n? Help Pls
23. Lauren and Kate drove 725 miles.
If Lauren drove 298 of those miles,
how many miles did Kate drive?
Answer:
427 miles
Step-by-step explanation:
725-298=427 miles
Answer: Kate drove 427 miles.
Explanation: 725 - 298 = 427.
Jill
had 3 full pan of brownie. Each pan made 10 brownie. He gave 3/8 of the brownie to her friend how many brownie did jill give away
Using Mathematical operations we can conclude that Jill gave 11 brownies to her friend.
What are mathematical operations?A mathematical function known as an "operation" in mathematics is one that converts zero or more input values into a precisely specified output value.
The quantity of operands has an impact on the operation's complexity.
Most people concur that the four basic mathematical operations are addition, subtraction, multiplication, and division.
So, we know that Jill has 3 full pans of brownies.
Each pan contains 110 brownies.
So total brownies Jill has:
10*3 = 30 brownies
Now, she gave 3/8 brownies to her friend.
So, the number of brownies Jill gave away are:
30 * 3/8
15 * 3/4
45/4
11.25
Rounding off: 11
Therefore, using Mathematical operations we can conclude that Jill gave 11 brownies to her friend.
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4/6 - 1/12 simplified
After solving the given expression, the value obtained will be equal to 7/12.
What are arithmetic Operations?The four fundamental operations of arithmetic are addition, subtraction, multiplication, and division of two or even more items.
Included in them is the study of integers, especially the order of operations, which is important for all other areas of mathematics, notably algebra, data management, and geometry.
As per the given fraction in the question,
4/6 - 1/12
Take LCM as 12 and then solve,
= (8 - 1)/12
= 7/12
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What is the value of x?
Answer:
3
Step-by-step explanation:
5x = 6x - 3
6x - 5x = 3
x = 3
An airplane pilot whose craft has an air speed of 150km / hr whishes to fly on a true course of N 65 E. A 15 km / hr wind is blowing with a bearing of S 45 E. In what direction should the plane be pointed? What will be the plane's ground speed?
speed of plane's ground = 155.769 Km/h
What is speed and velocity ?Speed is the rate at which an object travels along a path over time, whereas velocity is the speed and direction of an item's motion. In other words, speed is a scalar value, but velocity is a vector.
What are the units of speed ?Units of speed = meter per second
So ln [tex]$\triangle A O B$[/tex], we have
[tex]$$[/tex]A=65[tex]^{\circ}+45^{\circ}=110^{\circ} \\[/tex]
O A=[tex]150 \mathrm{~km} / \mathrm{h} \\[/tex]
A B=15 [tex]\mathrm{~km} / \mathrm{h}[/tex]
[tex]\end{aligned}[/tex]using cosine Rule
[tex]\cos A=\frac{O A^2+A B^2-O B^2}{2(O A)(A B)} \\[/tex]
[tex]\cos 110^{\circ}=\frac{(150)^2+(15)^2-O B^2}{2(150)(15)} \\[/tex]
[tex]4500 \cos 110^{\circ}=22500+225-0 B^2 \\[/tex]
[tex]-1539.09064=22725-0 B^2 \\[/tex]
[tex]O B^2=22725+1539.09064 \\[/tex]
[tex]O B^2=24,264.0906 \\[/tex]
[tex]O B=155.769351 \approx 155.769 \mathrm{~km} / \mathrm{hr} \\[/tex]
[tex]O B \approx 17 \mathrm{k}[/tex]
using sine rule
[tex]\frac{\sin (A O B)}{15}=\frac{\sin A}{O B} \\[/tex]
[tex]\frac{\sin (A O B)}{15}=\frac{\sin 110^{\circ}}{155.769351} \\[/tex]
[tex]\sin (A O B)=\frac{15 \sin 110^{\circ}}{155.769351}=\frac{14.0953893}{155.769351}[/tex]
[tex]\sin (A \cap B)=0.0904888491 \\[/tex]
[tex]A O B=\sin ^{-1}(0.0904888491) \\[/tex]
[tex]A D B=5.19173084^{\circ} \\[/tex]
[tex]A O B=5.2^{\circ}[/tex]
Direction of plane [tex]=65^{\circ}+5.2^{\circ} \\[/tex] = [tex]=70.2^{\circ}[/tex]
Direction N = 70.2° E
speed of plane's ground [tex]$=155.769 \mathrm{~km} / \mathrm{h}$[/tex]
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What is the value of x? My
Answer:
x = 71
Step-by-step explanation:
Since the legs of the triangle are congruent, both 21 , then the triangle is isosceles with base angles congruent.
Then
x = (180 - 38) ÷ 2 = 142 ÷ 2 = 71
I really need help What is the image point of (9,3) after the transformation r x-axis ∘D 1/3?
The image point of (9,3) after the transformation r x-axis is (-9, -3 ).
How does transformation of a function happens?The transformation of a function may involve any change.
Usually, these can be shift horizontally (by transforming inputs) or vertically (by transforming output), stretching (multiplying outputs or inputs) etc.
Since we know that Horizontal shift (also called phase shift):
Left shift by c units:
y=f(x+c) (same output, but c units earlier)
Therefore, Under a counterclockwise
a point (x, y ) → (- x, - y ) , thus
(9, 3 )→ (-9, -3 )
Therefore, the image point of (9,3) after the transformation r x-axis is (-9, -3 ).
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Help me with this actual L question
Answer:
[tex]\frac{t^6u^4w^{10}}{v}[/tex]
Step-by-step explanation:
1.) Simplify. Anything to the power of 0 is equal to 1, meaning that you don't have to pay attention to those variables. This brings us with [tex]t^5u^7v^{-1}wtu^{-3}w^9[/tex].
2.) Combine common powers. When you multiply, you add the exponents. This brings us with [tex]t^6u^4w^{10}v^{-1}[/tex].
3.) Finally, negative exponents can be brought to the denominator, so we get [tex]\frac{t^6u^4w^{10}}{v}[/tex].
look at the screenshot
Answer:
c) 72-34=38
Step-by-step explanation:
95 % of the class is on santa's nice list if there are 20 students how many are naughty
Answer: 1 Student
Step-by-step explanation:
Hope this helps!
what is the volocity of a plane that traveled 3,000 miles from new york to california in 4.5 hours? socratic.org
What is speed?
Velocity is defined as the speed of movement of an object along its direction. Velocity tells you how fast an object is moving and the direction it's moving. Similar to velocity, but also adds direction. Therefore, velocity is directed velocity, although velocity has no direction.
how to calculate speed
Find the initial velocity of an object by dividing the time it took the object to travel the specified distance by the total distance. In the formula V = d/t, V is velocity, d is distance, and t is time.
According to the question given data,
Distance=3000miles
Time=4.5hours
Put the value of formula
V=3000/4.5
V=666.66m/s
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A Survivorship Life Insurance Plan insures how many people under one plan?
More than three
One
Three
Two
A single survivorship life insurance policy can provide coverage for up to two persons.
What is meant by Life Insurance Plan?A contract between an insurance policy holder and an insurer or assurer in which the insurer agrees to pay a specified beneficiary a certain amount of money upon the death of an insured person is known as life insurance (or life assurance, particularly in the Commonwealth of Nations) (often the policyholder). Other occurrences, such critical illness or terminal disease, may also result in payment, depending on the contract. Usually, a premium is paid by the policyholder, either on a regular basis or all at once. Other costs, such burial costs, can be covered by the benefits.
Consequently, a single survivorship life insurance policy might provide coverage for two persons. These policies, which are also known as second-to-die joint life insurance, only provide a death benefit following the passing of both policyholders.
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Need help with this.
Answer:
93.331 ft
Step-by-step explanation:
Use the trigonometric function sine (opposite/hypotenuse)
sin(59) = 80
1 x
You can switch x and sin(59)
x = 80
sin(59)
Plug into calculator
x = 93.331 ft
Ann, ben and cheryl hare ome money in the ratio 3:7:10. Ben receive £650 more than Ann. Calculate the total amount of money that they hared
The total amount of money that they hared is 13000.
What is amount?
The amount of something is how much there is, or how much you have, need, or get. He needs that amount of money to survive. [ + of] I still do a certain amount of work for them.
Ann, ben and cheryl hare ome money in the ratio 3:7:10
Ben receive £650 more than Ann.
Ann = 3*650=1950
ben= 7*650=4550
cheryl hare ome = 10*650= 6500
The total amount of money that they hared 1950+4550+6500= 13000.
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Jaylen and Ryan are saving up for holiday gifts for their families. Jaylen has $340 in his savings account and earns an additional $15 per week from doing chores. Ryan has $220 in her savings account and earns $25 per week from doing chores. How many weeks will it take to save up the same amount of money?
Jaylen and Ryan will have same amount of money after 12 weeks .
Let the no of weeks after which both of them will have equal amount be x
therefore, after x weeks the amount of money in
Jaylen's account = 340 + 15x
Ryan's account = 220+ 25x
Now, since these amount is equal
therefore,
340 + 15x = 220+ 25x
on solving this equation we get ,
=>340 - 220 = 25 x - 15x
=> 120 =10x
=> x = 12
First order equations include linear equations. In the coordinate system, the linear equations are defined for lines. A linear equation in one variable is one in which there is a homogeneous variable of degree 1 (i.e., only one variable).
Multiple variables may be present in a linear equation. Linear equations in two variables, for example, are used when a linear equation contains two variables. Examples of linear equations include 2x - 3 = 0, 2y = 8, m + 1 = 0, x/2 = 3, and 3x - y + z = 3.
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The number of students who are active in the computer club has jumped from 7 to 19. To the nearest percent, what is the percent increase?
Answer:
63.2%
Step-by-step explanation:
percentage increase= (Increase \ old number) * 100
= {(19 -7)/ 19} * 100
= (12\19) * 100
=63.16 %
Mitzi received some gourmet brownies as a gift. The wrapper said each brownie was 451 calories, and had 252
calories of fat. What percent of the total calories in each brownie comes from fat?
The percent of the total calories in each brownie comes from fat will be;
⇒ 35.84%
What is mean by Percentage?A number or ratio that can be expressed as a fraction of 100 or a relative value indicating hundredth part of any quantity is called percentage.
Given that;
The wrapper said each brownie was 451 calories, and had 252 calories of fat.
Now,
Since, The wrapper said each brownie was 451 calories, and had 252
calories of fat.
Hence, Total calories = 451 + 252
= 703 calories
And, The calories of fat = 252 calories
Thus, The percent of the total calories in each brownie comes from fat is find as;
⇒ Percent = 252/703 × 100
= 35.84%
Therefore, The percent = 35.84%
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solve the matrix equations
with full explanations and workings please
Answer:
Step-by-step explanation:
x<60
For the three-part question that follows, provide your answer to each question in the given workspace. Identify each part with a coordinating response. Be sure to clearly label each part of your response as Part A, Part B, and Part C.
A bag contains three blue marbles, five red marbles, and four green marbles.
Part A: What is the probability of selecting three marbles where one is blue and two are green?
Part B: What is the probability of selecting one blue marble and then selecting three red marbles?
Part C: In your own words, write a short paragraph that explains your work for Parts A and B.
The probabilities for the given problem is calculated as 0.081 and 0.06 respectively.
What is probability?Probability is the branch of Mathematics that deals with the measurement of the chance of occurrence of a random event.
The probability of any event always lie in the close interval of 0 and 1 [0,1].
The zero value of probability indicates that the event will not happen while its value equal to one indicate that it will happen.
Given that,
There are 3 blue marbles, 5 red marbles and 4 green marbles.
Then, the total number of marbles is 12.
The given problem can be solved as follows,
Part A:
The probability of getting 1 blue and 2 green marbles is,
P( 1 blue and 2 green) = (³C₁ × ⁴C₂)/¹²C₃
= ( 3 × 6)/ 220
= 9/110
= 0.081
Part B:
The probability of selecting one blue marble = 3/12 = 1/4
After one blue marble is selected, the remaining number of marbles is 11.
Thus, probability of selecting 3 red marbles is,
⁵C₃/¹¹C₃
= 10/165
= 0.06
Part C:
In the Part A the probability is calculated by taking the ratio of total number of ways of selecting 3 marbles and the number of ways of selecting 1 blue and 2 green marbles.
And, in Part B the number of ways is calculated from the remaining number of marbles after one blue marble is chosen.
Hence, the probabilities for the given parts in the question are 0.081 and 0.06 respectively.
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I need help please! It’s ASAP
Answer:
28
Step-by-step explanation:
[tex]80 \times \frac{35}{100 } \\ = 28[/tex]
Answer:
28
Step-by-step explanation:
From the given pie chart:
35% of the people surveyed selected blue as their favorite color.If a total of 80 people were surveyed, to find the number of people in the sample that chose blue, simply find 35% of 80:
[tex]\begin{aligned}\implies \sf 35\%\;of\;80 & = \sf \dfrac{35}{100} \times 80\\\\&= \sf \dfrac{35 \times 80}{100} \\\\&= \sf \dfrac{2800}{100} \\\\&=\sf 28\end{aligned}[/tex]
Therefore, 28 people from a total of 80 surveyed chose blue as their favorite color.
The general term Tn of a sequence is
4+n
2n
Find the 4th term and the 6th term in the sequence.
The 4th term and the 6th term in the sequence are 1 and 5/6
How to determine the 4th term and the 6th term in the sequence.From the question, we have the following parameters that can be used in our computation:
Tn= (4 + n)/2n
The 4th term and the 6th term in the sequence means that
n = 4 and n = 6
Substitute the known values in the above equation, so, we have the following representation
n = 4:
T(4) = (4 + 4)/2(4)
Evaluate
T(4) = 1
n = 6:
T(6) = (4 + 6)/2(6)
Evaluate
T(6) = 5/6
Hence, the terms are 1 and 5/6
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Whoever answers correctly and with an explanation will get marked Brainliest!!
There are 35 questions total located in Mathematics. This is Algebra I!
Answer: increasing by 0.25
Step-by-step explanation:
Find the values of x and y
Answer: A
Step-by-step explanation:
We see that the x is a right angle, so it must be a 90-degree angle!
For y, we know that a triangle has 180 degrees, we already know the other two angles are 90 and 64, add both together, equal 154.
180 - 154 = 26, so y is 26 degrees!
So the answer is A