To solve for the problem, the formula is:
n = [z*s/E]^2
where:
z is the z value for the confidence interval
s is the standard deviation
E is the number of units
So plugging that in our equation, will give us:
= [1.96*9.38/3]^2
= (18.3848/3)^2
= 6.1284^2
= 37.5 or 38
Geraldo wants to start a group bike ride on Sunday mornings for students at his school. He asked 30 students in the lunchroom how many miles they ride their bikes each month. He obtained the following results. 8, 3, 0, 1, 2, 3, 6, 3, 0, 4, 13, 1, 3, 12, 15, 2, 1, 3, 2, 2, 0, 3, 4, 2, 6, 7, 12, 8, 4, 0 The fraction x/30 shows the ratio of the number of students who ride their bikes more than 10 miles each month to the number of students surveyed. What is the value of x?
Answer:
x = 4 is the answer.
Step-by-step explanation:
List of rides in a month of 30 students have been given in the question.
We have to find the value of x if fraction x/30 shows the ratio of the number of students who ride their bikes more than 10 miles each month to the number of students surveyed.
Therefore x/30 = 4/30
x = 4×30/30 = 4
So x = 4 is the answer.
If an item is 1/3 off, to calculate the final price simply divide the original price by 3.
true or false
what is the equation of the horizontal line passing through the point (2,-8)
There are four large groups of people, each with 1000 members. any two of these groups have 100 members in common. any three of these groups have 10 members in common. and there is 1 person in all four groups. all together, how many people are in these groups? (scheinerman 116) scheinerman, edward
a. mathematics: a discrete introduction, 3rd edition. cengage learning, 20120305. vitalbook file.
Final answer:
Using the principle of Inclusion-Exclusion, and taking the common members in two, three, and four groups into account, we find that there are 3439 unique members across the four groups.
Explanation:
To solve this problem, we need to use the principle of Inclusion-Exclusion. Let's denote the four groups as A, B, C, and D. According to the question, each group has 1000 members (n(A) = n(B) = n(C) = n(D) = 1000).
Any two groups have 100 members in common. That means, for instance, n(A ∩ B) = n(A ∩ C) = n(A ∩ D) = n(B ∩ C) = n(B ∩ D) = n(C ∩ D) = 100.
Any three groups have 10 members in common, which gives us n(A ∩ B ∩ C) = n(A ∩ B ∩ D) = n(A ∩ C ∩ D) = n(B ∩ C ∩ D) = 10.
There is 1 person in all four groups, so n(A ∩ B ∩ C ∩ D) = 1.
The total number of unique members in all groups, denoted as n(A ∩ B ∩ C ∩ D), is given by:
n(A ∩ B ∩ C ∩ D) = n(A) + n(B) + n(C) + n(D) - [sum of the number of common members between every two groups] + [sum of the number of common members between every three groups] - [number of members common to all four groups].
Substituting the values:
n(A ∩ B ∩ C ∩ D) = 4(1000) - [6(100)] + [4(10)] - 1 = 4000 - 600 + 40 - 1 = 3439.
Therefore, there are 3439 unique members across all groups.
7,243 ÷ 4.
What is the remainder?
Does x=5 in this equation? ... 2+3(x+1)=6x
The equation for line g is given by 5y=2x-20. Suppose line g is parallel to like r and line e is perpendicular to line g. Point (10,-8) lies on both line r and line
A company makes 3 types of cable. cable a requires 3 black, 3 white, and 2 red wires. b requires 1 black, 2 white, and 1 red wire. c requires 2 black, 1 white, and 2 red wire. they used 120 black, 110 white and 100 red wires. how many of each cable were made? setup the system of equations to solve this problem by selecting the coefficients and constants for each colored wires.
To determine the number of each cable produced, a system of equations is set up with variables representing the cable types and coefficients corresponding to the number of wires used per cable. The system consists of three equations based on the colors of wires and the totals used.
To solve this problem, we can set up a system of equations where the unknowns are the number of each type of cable produced. Let's represent the number of type A cables as x, type B cables as y, and type C cables as z. Considering the number of wires used for each type of cable and the total used, we form the following equations:
3x + y + 2z = 120 (black wires)3x + 2y + z = 110 (white wires)2x + y + 2z = 100 (red wires)To find the number of each cable made, we need to solve this system of equations simultaneously. The coefficients represent the number of each color wire needed for each cable type, and the constants (120, 110, 100) represent the total number of wires used.
Find the indicated partial derivatives. w = x y + 7z
Roy is saving to buy a new bike, which costs $258. He has $16 towards this purchase. Express how much more Roy needs in the form of an equation?
F(x, y, z) = xe^(5yz) find the gradient of f
Consider the function below.
x -1 0 1 2
f(x) -2 3 8 13
Which of the following functions could be the inverse of function f?
x -2 3 8 13
q(x) -1 0 1 2
x -2 -3 -8 -13
r(x) 1 0 -1 -2
x -1 0 1 2
p(x) 2 -3 -8 -13
x 1 0 -1 -2
s(x) -2 3 8 13
If the temperature at which a certain compound melts is a random variable with mean value 120 ???? ???? and standard deviation 2 ???? ???? , what are the mean temperature and standard deviation measured in �
The standard error of the sample mean is approximately 0.0671 degrees Fahrenheit when rounded to two decimal places. The distribution of the sample mean is a t-distribution due to the use of the sample standard deviation as an estimate.
Explanation:The question involves calculating the standard error of the sample mean for a set of body temperature measurements. To find the standard error, we use the formula: standard error = sample standard deviation / sqrt(sample size). With a sample standard deviation of 0.3 degrees Fahrenheit and a sample size of 20, the standard error is calculated as:
standard error = 0.3 / sqrt(20)
standard error = 0.3 / 4.472
standard error ≈ 0.0671 (rounded to two decimal places)
The distribution of the sample mean is a t-distribution because we are using the sample standard deviation as an estimate of the population standard deviation, which is unknown.
There is a probability of 0.93 that a visitor to a website will bounce (leave the website without clicking on any links). what is the probability that at least 10 of the next 12 visitors to the website will bounce?
Final answer:
To find the probability that at least 10 of the next 12 website visitors will bounce, you calculate the sum of the binomial probabilities for 10, 11, and 12 successes (bounces) out of 12 trials.
Explanation:
To find the probability that at least 10 of the next 12 visitors to a website will bounce, we can use the binomial probability formula:
P(X = k) = C(n, k) * p^k * (1 - p)^(n - k)
Where:
C(n, k) is the combination of n items taken k at a time.
p is the probability of a single success (in this case, a bounce).
k is the number of successes.
n is the total number of trials.
In this question:
p = 0.93 (probability of bounce)
n = 12 (total visitors)
We want to calculate the probability of at least 10 bounces, so we need to calculate P(X = 10) + P(X = 11) + P(X = 12).
P(X = 10) = C(12, 10) * 0.93^10 * (1 - 0.93)^(12 - 10)
P(X = 11) = C(12, 11) * 0.93^11 * (1 - 0.93)^(12 - 11)
P(X = 12) = C(12, 12) * 0.93^12 * (1 - 0.93)^(12 - 12)
The final probability is the sum of these three probabilities.
Solve the system
4x+2y=7 y=5x
A. (1,5)
B. (3,15)
C. (2,10)
D. (0.5,2.5)
The ratio 30 in. To 9ft in simplest form
Suppose that work hours in new zombie are 200 in year 1 and productivity is $18 per hour worked. instructions: in part a, enter your answer as a whole number. in part b, round your answer to 2 decimal places.
a. what is new zombie's real gdp
Each newborn baby has a probability of approximately 0.49 of being female and 0.51 of being male. for a family with four children, let x = the number of children who are girls.
I believe this problem has 3 questions:
a. Explain why the three conditions are satisfied for X to have the binomial distribution.
b. Identify n and p for the binomial distribution.
c. Find the probability that the family has two girls and two boys.
Answers:
a. First because there are only 2 possible outcomes for
each birth: male or female. Hence a binomial distribution.
Second, because the probability of giving out a girl is
constant: 0.49 for each birth.
Third, the probability of a giving out a girl does not depend
on whether or not there is already a boy or a girl in the family.
b. The n is the total number of children, so n = 4
While the p is the success of being a girls, so P = 0.49
c. We use the binomial probability equation:
P (X) = nCx * p^x * q^(n-x)
P(X=2) = 4!/(2!2!) * 0.49^2 * 0.51^2 = 0.3747
Final answer:
Inheritance of sex chromosomes in babies is determined by the father, leading to a 50:50 chance of a male or female child. The likelihood of a newborn being female is around 0.49.
Explanation:
Sex Inheritance: The sex of a baby is determined by the father, who has a 50 percent chance of passing on a Y chromosome resulting in a male child. If the baby inherits two X chromosomes, it will be female. This 50:50 chance applies to each baby. For a family with four children, let x = the number of girls, the probability of a child being female is approximately 0.49.
In one month Miranda earned $800 at her part-time job, and $70 was withheld for federal income tax. Suppose she earns $1200 next month. How much will be withheld for federal income tax?
Solve for x.
5x - 1 = 26
x = 27/5
x = 5
x = -5
In how many ways can 3 Americans, 4 Frenchmen, 4 Danes and 2 Italians be seated in a row so that those of the same nationality sit together?
The total number of ways in which the members of the different nationalities can be seated such that those of the same nationality sit together is 331776 ways. This is calculated using the concept of permutations.
Explanation:This question can be solved using the concept of permutations and combinations. We assume that groups of people of the same nationality are distinct. Thus, we can treat them as individual entities. We have four entities in total: a group of 3 Americans, a group of 4 Frenchmen, a group of 4 Danes, and a group of 2 Italians.
Firstly, these 4 entities can be arranged in 4! ways, which is 4*3*2*1 = 24 ways.
Within each nationality group, the people can be arranged amongst themselves in the following ways: Americans - 3!, Frenchmen - 4!, Danes - 4! and Italians - 2!. This is equal to 3*2*1 = 6, 4*3*2*1 = 24, 4*3*2*1 = 24 and 2*1 = 2 respectively.
Therefore, the total number of ways in which the nationalities can be seated such that those of the same nationality sit together is:
4! * (3! * 4! * 4! * 2!) = 24 * (6 * 24 * 24 * 2) = 331776 ways.
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The number of ways the Americans, Frenchmen, Danes, and Italians can be seated together is 20,736.
Explanation:To count the number of ways the Americans, Frenchmen, Danes, and Italians can be seated together, we can treat each nationality as a single group and consider the groups as individuals. Therefore, we have 4 groups to arrange in a row. Within each group, the individuals can be arranged among themselves. The number of ways to arrange the individuals within a group is given by the factorial of the number of individuals in that group. So, the total number of arrangements is:
Number of arrangements = 4! × 3! × 4! × 2!
Substituting the factorials with their corresponding values:
Number of arrangements = 24 × 6 × 24 × 2 = 20,736
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Which of the following is the correct factored form of the given equation? 4x 2 - 11x + 6 = 0
[tex]4x^2-11x+6=0\\\\4x^2-8x-3x+6=0\\\\4x(x-2)-3(x-2)=0\\\\(x-2)(4x-3)=0[/tex]
Answer:
(4x - 3)(x - 2) = 0
on monday your bank account was balanced -$12.58 because you didn't realize this, you wrote a check for -$30.72 for groceries what is the new balance in your checking account?
The new balance after I bought groceries worth of 30.72 dollars is -43.3 dollars.
What are he types of sign distributions?Sign distributions are of four types they are:- negative distributed to negative results in positive and positive distributed positive results to positive. Negative distributed to positive or vice versa results in negative.
According to the given question on Monday I had -12.58 dollars.
I bought some groceries worth -30.72 dollars which will also be deducted from my bank account.
∴ The final balance I have is ( -12.58 - 30.72) dollars which is,
= -43.3 dollars.
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you put 500$ in a savings account. The account earns 15.75$ simple interest in 6 months.what is the annual interest rate
Paula runs around the local park. What is the perimeter of the park. Give your and in kilometres
There are currently 3 students signed up for a trip. The van can transport only 7 students.
Which graph shows all the possible values for the extra number of students that need to sign up so that more than one van is needed to transport them?
Number line with closed circle on 4 and shading to the right.
Number line with closed circle on 4 and shading to the left.
Number line with open circle on 4 and shading to the right.
Number line with open circle on 4 and shading to the left.
Answer:
what he said up so he can get brainliest
Step-by-step explanation:
GEOMETRY!! Provide the missing reasons for the proof.
Given: AB ≅ CD
BA ⊥ AC
DC ⊥ AC
Prove: BC ≅ DA
The triangle ΔABC is congruent to the triangle ΔCDA. Then the side BC is equal to the side DA.
What is the triangle?The polygonal shape of a triangle has a number of sides and three independent variables. Angles in the triangle add up to 180°.
The triangles are said to be identical if the two sides and that included aspect of one triangle match the two sides and that includes the degree of the other triangle.
The ratio of the matching sides will remain constant if two triangles are comparable to one another.
Statements Reason
AB = CD (Given)
AC = AC (Reflexive Property)
BA ⊥ AC and DA ⊥ AC (Given)
∠BAC = ∠DCA (Perpendicular makes right angle)
ΔABC ≅ ΔCDA (Congruent triangle)
BC = DA (Corresponding sides are equal to a congruent triangle)
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How many grams are in 1.40 moles of sodium chloride (NaCl)?
The molar mass of NaCl is 58.44 g / mol. So we can calculate the mass by simply multiplying the number of moles and molar mass. That is:
mass = 1.40 moles * 58.44 g / mol
mass = 81.82 grams
Final answer:
To find the mass in grams of 1.40 moles of sodium chloride, multiply the number of moles by the molar mass of NaCl, which is 58.44 g/mol, resulting in 81.816 grams.
Explanation:
To calculate the mass of 1.40 moles of sodium chloride (NaCl), we will use the molar mass of NaCl as a conversion factor. The molar mass of NaCl is 58.44 grams per mole. Here's how you can do the conversion:
Find the molar mass of NaCl: 22.99 g/mol (Na) + 35.45 g/mol (Cl) = 58.44 g/mol (NaCl).
Multiply the number of moles of NaCl by the molar mass to get the mass in grams: 1.40 moles × 58.44 g/mol = 81.816 grams of NaCl.
So, 1.40 moles of sodium chloride weigh 81.816 grams.
Randall record 8 songs on his most recent cd. The total length of the cd is 49 minutes find a unit rate to represent the average
(1 point) consider the function f(t)=⎧⎩⎨⎪⎪⎪⎪0,−5,−6,6,t<00≤t<11≤t<7t≥7;f(t)={0,t<0−5,0≤t<1−6,1≤t<76,t≥7; 1. write the function in terms of unit step function
Final answer:
The function f(t) can be represented in terms of the unit step function as f(t) = -5u(t) - u(t-1) + 6u(t-7), with each term turning on at specific breakpoints.
Explanation:
To write the function f(t) in terms of the unit step function, you can think of f(t) as a piecewise function that changes values at various breakpoints. The unit step function, denoted as u(t), is defined to be 0 when t < 0 and 1 when t ≥ 0. For the given function f(t), we can write it using the unit step function as follows:
f(t) = -5u(t) -u(t-1) + 6u(t-7)
This representation uses the properties of the unit step function to 'turn on' different function values at specified points. Each term corresponds to a segment of the piecewise function, with the coefficients representing the value of f(t) within each segment.