The amount of time a bank teller spends with each customer has a population mean = 3.10 minutes and standard deviation = 0.40 minute. if a random sample of 16 customers is selected without replacement from a population of 500 customers,
a. what is the probability that the average time spent per customer will be at least 3 minutes?
b. there is an 85% chance that the sample mean will be below how many minutes?
a. First we solve the finite population correction factor σx from the formula:
σx = [s / sqrt(n)] * sqrt [(N – n) / (N – 1)]
σx = [0.40 / sqrt(16)] * sqrt[(500 – 16) / (500 – 1)]
σx = 0.0985
Then we compute for z score when x ≥ 3 minutes:
z = (x – m) / σx
z = (3 – 3.10) / 0.0985
z = -1.015
From the tables, the probability (p value) using right tailed test is:
P = 0.845 = 84.5%
b. At P = 0.85, the z score is z = 1.04
1.04 = (x – 3.10) / 0.0985
x = 3.20
Hence there is a 85% chance it will be below 3.20 minutes
Final answer:
The probability that the average time spent per customer will be at least 3 minutes is approximately 0.8413. There is an 85% chance that the sample mean will be below approximately 3.359 minutes.
Explanation:
a. To find the probability that the average time spent per customer will be at least 3 minutes, we need to find the probability that the sample mean is greater than or equal to 3 minutes. Since the population standard deviation is known and the sample size is large (n=16), we can use the z-score formula and the standard normal distribution to calculate the probability. The z-score is calculated as follows:
z = (x - µ) / (σ / √n)
where x is the sample mean, µ is the population mean, σ is the population standard deviation, and n is the sample size. Substituting the values into the formula:
z = (3 - 3.10) / (0.40 / √16) = -0.1 / (0.40 / 4) = -0.1 / 0.1 = -1
Looking up the corresponding area to the left of z=-1 in the standard normal distribution table, we find that the probability is approximately 0.1587. Therefore, the probability that the average time spent per customer will be at least 3 minutes is approximately 0.8413.
b. To find the value below which there is an 85% chance that the sample mean will be, we need to find the z-score that corresponds to the cumulative probability of 0.85. Using the standard normal distribution table, we find that the z-score is approximately 1.036. Substituting the values into the z-score formula:
1.036 = (x - 3.10) / (0.40 / √16)
Solving for x:
1.036 * (0.40 / √16) + 3.10 = x
x ≈ 0.259 + 3.10 ≈ 3.359
Therefore, there is an 85% chance that the sample mean will be below approximately 3.359 minutes.
Suppose that work hours in new zombie are 200 in year 1 and productivity is $8 per hour worked. what is new zombie's real gdp? if work hours increase to 210 in year 2 and productivity rises to $10 per hour, what is new zombie's rate of economic growth?
Final answer:
New Zombie's real GDP in year 1 is $1600 and in year 2 is $2100, resulting in a rate of economic growth of 31.25%.
Explanation:
To calculate the real GDP of New Zombie we must multiply the work hours by the productivity (value produced per hour).
For year 1, the real GDP is calculated as follows:
200 hours * $8 per hour = $1600.
For year 2, we calculate the real GDP as:
210 hours * $10 per hour = $2100.
Now, to find the rate of economic growth from year 1 to year 2, we use the formula:
((GDP in year 2 - GDP in year 1) / GDP in year 1) * 100
= (($2100 - $1600) / $1600) * 100
= 31.25%.
Thus, New Zombie's rate of economic growth is 31.25%.
name the numerator and the denominator in each fraction 11/12 7/512 12/10 0/78
Sean, a freelance editor, charges the rates shown in the table below to edit manuscripts. The cost per page increases as the quality of editing improves. Sean also gives a 5% discount if the entire amount is paid up front. A 2 column table with Type of Editing and Cost per page as the column headings. Express Proofreading costs 2 dollars, Basic Proofreading 2.95 dollars, Extended Proofreading 3.95 dollars, and Deep Editing 11 dollars Michelle has an 85-page manuscript. The equation below shows the relationship between the total cost of editing 85 pages, T, and the cost per page, c, if she gets the 5% discount: 85c − 0.05(85c) = T Using the equation, what is the best quality of editing that Michelle can get done for a maximum of $161.50? Express proofreading Basic proofreading Extended proofreading Deep editing
A client is instructed to take 1 1/2 teaspoons of a cough syrup 3 times a day. How many teaspoons of cough syrup will the client take each day?
A fraction is a way to describe a part of a whole. The number of teaspoons of cough syrup that the client will take each day is 4 1/2 teaspoons.
What is a Fraction?A fraction is a way to describe a part of a whole. such as the fraction ¼ can be described as 0.25.
What is Mixed Fractions?A mixed fraction is a fraction that contains a whole number and a fraction whose denominator is greater than the numerator. A mixed fraction can be converted as,
2 1/2
= (2×2 + 1)/2
= 5/2
= 2.5
Given that a client is instructed to take 1 1/2 teaspoons of cough syrup 3 times a day. Therefore, the number of teaspoons of cough syrup that the client will take each day is,
Number of teaspoons = 3 × 1 1/2 teaspoons
= 3 × (2×1 + 1)/2
= 3 × 3/2
= 9/2
= 4 1/2
= 4.5
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Write the quadratic as a product of factors irreducible over the reals. x2 + 16
Answer:
The product of factors irreducible over the reals are [tex]x^2+16=(x+4i)(x-4i)[/tex]
Step-by-step explanation:
Given : Quadratic form [tex]x^2+16[/tex]
To find : Write the quadratic as a product of factors irreducible over the reals?
Solution :
To find the product first we have to find the roots of the quadratic.
[tex]x^2+16=0[/tex]
[tex]x^2=-16[/tex]
Root both side,
[tex]\sqrt{x^2}=\sqrt{-16}[/tex]
[tex]x=\pm 4i[/tex]
So,The factors of the quadratic equation is [tex](x+4i)(x-4i)[/tex] in the form of complex number.
Therefore, The product of factors irreducible over the reals are [tex]x^2+16=(x+4i)(x-4i)[/tex]
If arrivals occur at a mean rate of 3.6 events per hour, the exponential probability of waiting more than 0.5 hour for the next arrival is:
What is the most specific name that can be given to a figure with the following coordinates? (–10, 8), (–7, 13), (3, 7), and (0, 2)
Find the area of a parallelogram with the given vertices. P(1, 3), Q(3, 3), R(7, 8), S(9, 8) A. 10 units2 B. 5 units2 C. 20 units2 D. none of these
10 units squared should be your answer
Ralph has 957 race car stickers. He gave 10 to ken. He gave 100 to Matt. How many stickers does Ralph have left?
Ms. Banerjee bought a car for $22,500. The amount she paid for her new car was twice the amount she paid for her previous car, which she bought 8 years ago. Which equation shows p, the price in dollars that she paid for her previous car?
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which property is illustrated by the following statement? 5g+7= 7 + 5g
Answer:
The property which is illustrated by the statement 5g+7= 7 + 5g is:
Commutative property
Step-by-step explanation:
Commutative property states that:
If a and b are two elements defined under the operation *
Then, a*b=b*a
Here, we are given
5g+7= 7 + 5g
i.e. a=5g, b=7 and * = +
Hence, the property which is illustrated by the statement 5g+7= 7 + 5g is:
Commutative property
It costs $5.52 to park in parking lot A and $3.75 to park in parking lot B. How much more does it cost to park in parking lot A?
WILL GIVE BRAINEST
Which recursive formula can be used to represent the sequence 2,5,8,11,14
The recursive formula for the given AP series 2,5,8,11,14 is a₁ = 2 and [tex]a_{n} =a_{n-1} + 3[/tex] so option (D) will be correct.
What is Arithmetic progression?The difference between every two successive terms in a sequence is the same this is known as an arithmetic progression (AP).
The arithmetic progression has wider use in mathematics for example sum of natural numbers.
Natural number = 1,2,3,4,5,6,7,8...
Now it has the same difference between any two consecutive terms d =2-1 = 3-2
Given an ap series,
2,5,8,11,14
The first term (a₁) = 2
The nth term of AP can be given as
[tex]a_{n} =a_{n-1} + d[/tex] where d is a common difference.
d = 5 - 2 = 3
So,
[tex]a_{n} =a_{n-1} + 3[/tex]
Hence "The recursive formula for the given AP series 2,5,8,11,14 is a₁ = 2 and [tex]a_{n} =a_{n-1} + 3[/tex] ".
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Solve for x. 9≤17−4x Enter your answer, as an inequality, in the box.
Which expressions are equivalent to 6 +(–x) + 2x + (–7) + 2x? Check all that apply.
The correct options is 3. (3 - x + 2x - 4 + 2x) simplifies to (-1 + 3x ), which is equivalent.
The given expression is (6 + (-x) + 2x + (-7) + 2x). Simplifying this expression by combining like terms results in ( -1 + 3x). To check for equivalent expressions, we evaluate each option:
1. x + x + 6 - 7 + x simplifies to (3x - 1), which is not equivalent.
2. (2x + 2 + x) simplifies to (3x + 2), which is not equivalent.
3. (3 - x + 2x - 4 + 2x) simplifies to (-1 + 3x ), which is equivalent.
4. (x - 1) is not equivalent.
5. (x + 1) is not equivalent.
Therefore, only the expression (3 - x + 2x - 4 + 2x) is equivalent to the given expression. The simplified form of the original expression is ( -1 + 3x), and the equivalent expression confirms this result by matching the simplified terms.
Complete question:
Which expressions are equivalent to 6 +(–x) + 2x + (–7) + 2x? Check all that apply.
x + x + 6 – 7 + x2x + 2 + x3 – x + 2x – 4 + 2xx – 1x + 1The expressions that are equivalent to [tex]\(6 + x + 2x - 7 + 2x\)[/tex] are:
a. [tex]\(x + x + 6 - 7 + x\)[/tex]
c.[tex]\(3 - x + 2x - 4 + 2x\)[/tex]
The correct option is (a)&(c).
To find which expressions are equivalent to [tex]\(6 + x + 2x - 7 + 2x\)[/tex], let's simplify the given expression first:
[tex]\[6 + x + 2x - 7 + 2x\][/tex]
Combining like terms:
[tex]\[6 - 7 + x + 2x + 2x\][/tex]
[tex]\[(-1) + 5x\][/tex]
Now, let's check each option to see which ones are equivalent:
a.[tex]\(x + x + 6 - 7 + x\)[/tex]
Combine like terms:
[tex]\(3x - 1\)[/tex]
This expression is equivalent.
b. [tex]\(2x + 2 + x\)[/tex]
Combine like terms:
[tex]\(3x + 2\)[/tex]
This expression is not equivalent.
c. [tex]\(3 - x + 2x - 4 + 2x\)[/tex]
Combine like terms:
[tex]\(3 + 5x - 4\)[/tex]
[tex]\(5x - 1\)[/tex]
This expression is equivalent.
d. [tex]\(x - 1\)[/tex]
This expression is not equivalent.
e. [tex]\(x + 1\)[/tex]
This expression is not equivalent.
So, the expressions that are equivalent to [tex]\(6 + x + 2x - 7 + 2x\)[/tex] are:
a. [tex]\(x + x + 6 - 7 + x\)[/tex]
c.[tex]\(3 - x + 2x - 4 + 2x\)[/tex]
complete question given below:
Which expressions are equivalent to 6 +(x)+2x+(- 7) + 2x? Check all that apply.
a.x+x+6-7+x
b.2x+2+x
c.3-x+2x-4+2x
d.x-1
e.x+1.
Over a two-hour time period, a snail moved 72 inches. How far is this in yards?
A snail moved distance of 2 yards.
What is metric conversion?Metric Conversion refers to the conversion of the given units to desired units for any quantity to be measured.
Given that, over a two-hour time period, a snail moved 72 inches.
We know that, 1 yard = 36 inches
Now, distance in yards = 72/36
= 2 yards
Therefore, a snail moved 2 yards.
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Jan’s pencil is 8.5 cm long. Ted’s pencil is longer. Write a decimal that could represent the length of Tex’s pencil?
Identify two factors that have a product of 1/12.
Evaluate |2x+y-3z| for x=-2, y=10, and z=3
How to solve?
A store is marking down the price of a television 25 percent from the original price of $250. Which expression can be used to find the marked down price?
A: $250 - (0.25)(250)
B: $250 + (0.25)(250)
C: $250 - (25)(250)
D: $250 + (25)(250)
Answer:
Option A.
Step-by-step explanation:
The original price of a television in a store = $250.00
The store is marking down the price of a television 25 percent from the original price.
25% = [tex]\frac{25}{100}[/tex] = 0.25
The expression can be used to find the marked down price
250 - ( 25% of 250)
= 250 - (0.25)(250)
Option A. is the answer.
which expression shows how 6 times 45 can be written using the distributive property?
A.6 times 4 + 6 times 5
B.6 times 40 + 6 times 5
C.6 times 40 + 6
D, 20 times 6 + 20 Times 5
Shailen is adding three numbers he gets a sum that is an even number between 10 and 20 show two addition equation shailen could have written
Shailen could have written two possible addition equations like 4 + 3 + 8 = 15 or 5 + 7 + 6 = 18. Both of these sum up to an even number between 10 and 20. Order of numbers doesn't matter in addition due to its commutative property.
Explanation:The problem is asking for two possible addition problems that Shailen could be solving if his sum ends up being an even number between 10 and 20. This involves an understanding of the properties of addition and how different number combinations can result in an even sum.
Here are two possible addition equations that meet the conditions:
4 + 3 + 8 = 15
5 + 7 + 6 = 18
In both cases, the sums fall between 10 and 20 and are even. It's worth noting commutativity of addition, which says the order in which numbers are added doesn't change the sum. Hence, you can rearrange the numbers in the addition (e.g., 3 + 4 + 8 or 8 + 4 + 3) and the sum will still remain the same.
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Complete the following statement of congruence:
Answer:
(C) ΔABC
Step-by-step explanation:
Congruence: Two figures or shapes can be congruent if they have same dimensions and shape.
From the given information, ΔXYZ is congruent to ΔABC as when according to the respective angles of ΔXYZ, the respective angles of the ΔABC matches and this makes them congruent to eachother.
Rest other options fails to satisfy the congruence criteria, thus option C is correct.
Hence, ΔXYZ is congruent to ΔABC.
What is the solution to the equation x + 7.5 = 21.5? A.x = 2.9 B.x = 7.8 C.x = 14 D.x = 29
Which statements are true about the graph of the function f(x) = 6x – 4 + x2?
Check all that apply.
The vertex form of the function is f(x) = (x – 2)2 + 2.
The vertex of the function is (–3, –13).
The axis of symmetry for the function is x = 3.
The graph increases over the interval (–3, ).
The function does not cross the x-axis.v
Construct a 95% confidence interval estimate of the mean net change in ldl cholesterol after the garlic treatment. what does the confidence interval suggest about the effectiveness of garlic in reducing ldl cholesterol?
Construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDLcholesterol?
sample mean = x-bar = 4.7
ME = 1.96*15.6/sqrt(43) = 4.663
95% CI: 4.7 - 4.663 < u < 4.7 + 4.663
The 95% confidence interval of (4.5, 9.5) suggests that the true average change in LDL cholesterol after the garlic treatment is likely to fall within this range. However, with a p-value of 0.1494, there isn't enough statistical evidence to conclusively affirm that the garlic treatment significantly reduces LDL cholesterol levels.
Explanation:To construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment, you have to be given or calculate the sample mean, the standard error, and the degrees of freedom. These factors depend on the data provided.
In this scenario, using the pre-calculated confidence interval provided, we have it at (4.5, 9.5). This means that we are 95% confident that the true population mean net LDL cholesterol change after garlic treatment is somewhere between a 4.5 unit decrease and a 9.5 unit decrease.
The effectiveness of the garlic treatment cannot be determined solely by this confidence interval, but this range might suggest a possible decrease in LDL cholesterol levels.
However, keep in mind that the p-value signifies the strength of the evidence against the null hypothesis. A p-value of 0.1494, as stated in the problem, means there isn't enough evidence to significantly conclude that the garlic treatment reduced LDL cholesterol at the 5% significance level.
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Write the fraction 14/16 in simplest form. If the fraction is in simplest form
There are 4 red cars and 6 blue cars parked in the car park at bens work place. On a transporter lorry travelling along side Ben on the motorway, there are 5 cars, 3 of which are red. In which situation is red most likely?
Assume employees' weekly gross earnings are $80,000, federal income tax withholding is $22,634.50, and FICA taxes are $11,920 in total for the employee and the employer. Determine the net amount to be paid to employees.