Suppose a population has a mean weight of 180 pounds and a standard deviation of 25 pounds. A sample of 100 items is drawn from this population. What is the standard error of the​ mean?

Answers

Answer 1

Answer:

We are given:

μ=180,σ=25,n=100

Therefore the standard error of the mean is

2.5

Step-by-step explanation:


Related Questions

Mr. Abdullah’s new car can travel 420 miles on a 12-gallon tank of gas. Determine how many miles he can travel on 8 gallons

Answers

Answer:

280

Step-by-step explanation:

Simplify (3√-5 +2)(4√-12 -1)
Thank you in advance
Full steps so I can understand!

Answers

Answer:

12√60 - 3√-5 + 8√-24  -2

Step-by-step explanation:

Use the distributive property

Multiply each by the other term outside their parantheses

for example multiply 3√-5 by 4√-12 and 3√-5 by -1.

Answer:

28

4

=

2

7

2

7

14

7

14

7

Explanation:

28

is the same as

2

×

14

witch in turn is the same as

2

2

×

7

Write as

7

2

2

×

7

Taking the

2

2

'outside' the square root changes it from

2

2

to

2

7

2

2

×

7

=

7

×

2

×

7

14

7

Step-by-step explanation:

Find the area of the shape shown below

Answers

Answer:

18 MARK AS BRAINLIEST OR ELSE!!!!

Step-by-step explanation:

area = 1/2h(sum of bases)

area = 1/2x3(3+9)

area = 1/2 of 36

area = 18

What is the domain of the relation?
✔ -4<=x<=6

What is the range of the relation?
✔ -4<=y<=4

Is the relation a function?
✔ yes


here are all the answers

Answers

Answer:

thx for ur help

For every left-handed person, there are about 4-right handed people. If there are 30 students in a class, predict the number of students who are right-handed.

Answers

Answer:

There are 24 right handed students

Step-by-step explanation:

This is a ratio question so it would be represented as 1:4.

First you would do 1 + 4 which is 5.

Then do 30 ÷ 5 which is 6.

Finally multiply 6 by 4 and 1.

So 6 × 4 × 1 is 24.

So there are 24 students who are right handed.

Hope this makes sense!

Need help !!ILL GIVE BRAINLEST!​

Answers

Answer:

Step-by-step explanation:

Whats the question???

lol suisitctftf ysyajwnw yakahad gwhnqga

Answers

im not sure what this is, or how to answer it

A holiday decoration involves blue and white lights the ratio of blue lights to white lights is three to two the box the decorations came in stated that the number of blue lights was 114 but didn't give the number of white lights or the total number of lights.

A) What is the ratio of the number of blue lights to the total number of lights?


B) If the total number of lights is represented by the variable t, create a proportion that you can use to solve for t and solve it.

Answers

The ratio of the number of blue lights to total lights is 3:5

The total number of lights is 190

How to solve for the ratio

To solve the problem we need to have the ratios out first.

we have a ratio of blue to white lights as

3 : 2

The ratio of the number of blue lights to white lights would be

114 : x

Such that we would have

3:2 = 114:x

This would give us

[tex]\frac{3}{2 } =\frac{114}{x}[/tex]

We would have to solve for the  value of x

To do this we are to cross multiply

3*x = 114*2

3x = 228

x = 228 / 3

= 76

ratio = 3 + 2 = 5

3 : 5

The proportion that can be used to solve for t is given as 114 : 3 = 38

38 x 5 = 190

or 114 + 76 = 190

Read more on ratios and proportions here: https://brainly.com/question/12024093

#SPJ1

Graph the line with the equation y = -x - 1.

Answers

that is what the line will look like.

This is a straight line. We only need 2 points to graph a straight line.

Let x = 0

y = -(0) - 1

y = -1

Our first point is (0,-1).

Let x = 1

y = -(1) - 1

y = -2

Our second point is (1,-2).

See attachment for graph.

There are 60 students in a classroom, 50% of the students are
boys. 30% of the boys and 60% of the girls want to buy the
new textbook. How many students want to buy the new
textbooks?
___ students

Answers

Answer:

28

Step-by-step explanation:

If 50% of students are boys that means there are 30 boys and 30 girls. Then if   30% of boys are 10 and 60% of girls are 18. You add 18+10 and that gives you 28.

The ages of the winners of a cycling tournament are approximately bell shaped. The mean age is 27.9 years, with a standard deviation of 3.3 years. The winner in one reason year was 26 years old

Answers

Answer:

200

Step-by-step explanation:

The length of a rectangle is (2x+3) and the width is x-5. If the perimeter is 44cm what is the length of the rectangle?

Answers

Perimeter = 2x length + 2x width.

2(2x+3) + 2(x-5) = 44

Simplify:

4x + 6 +2x -10 = 44

Combine like terms:

6x -4 = 44

Add 4 to both sides:

6x = 48

Divide both sides by 6:

X = 8

Now replace x with 8 in the equation for length:

2x + 3 = 2(8) +3 = 16 + 3 = 19 cm

Length = 19 cm

10. Anna divided integer A by -3 and got 8. Then she divided 8 by integer B and got -4. Find the quotient of integer A and B. I talling 2020​

Answers

Answer:

cant help uu :(

Step-by-step explanation:

If the ages in a classroom were 11, 12, 12, 13, 13, 14 - what would the median age be if you added someone that was 10 years old?

Answers

Answer: 12 years old

Step-by-step explanation:

10,11,12,12,13,13,14

The middle in these numbers is 12

Computer use.
A random sample of 197 12th-grade students from across the United States was surveyed, and it was observed that these students spent an average of 23.5 hours on the computer per week, with a standard deviation of 8.7 hours. If we plan to use these data to construct a 99% confident interval, the margin of error will be approximately.

(a.) 0.07
(b.) 0.62
(c.) 1.6
(d.) 8.7

Answers

Answer:

The margin of error will be approximately =

(c.) 1.6

Step-by-step explanation:

Sample of 12th-grade students = 197

Average hours spent on computer per week = 23.5 hours

Total hours spent = 4,625 (197 * 23.5) hours

Standard deviation = 8.7 hours

Confidence interval = 99%

Square root of sample size = [tex]\sqrt{x}[/tex] = 14.04

Standard deviation/square root of sample size = 8.7/14.04 = 0.6196

Z value at 99% confidence = 2.58

Margin of error = 0.6196 * 2.58

= 1.59857

= 1.6

This question can be determined by the  concept of standard deviation. The margin of 1.6 error will be approximately.

 

Given:

Random sample of 12th-grade students = 197

Average hours spent on computer per week = 23.5 hours

Therefore,

Total hours spent by 12th grade students  = [tex]\bold{(197 \times23.5=4629.5)hours}[/tex]  

Standard deviation = 8.7 hours (Given)

Confidence Interval =99% (Given)

 

Square root of  random sample size =  = 14.04

[tex]\bold{\dfrac{Standard\: deviation}{Square\: root\: of\: sample\: size} =\dfrac{8.7}{14.04 } = 0.6196}[/tex]

 

Therefore,

Z value at 99% confidence = 2.58

Margin of error = [tex]0.6196 \times2.58[/tex]  

                          = 1.59857 error

                          = 1.6 error

Thus, the correct option is (c) 1.6 error.

For further details, please refer this link:

https://brainly.com/question/13905583

find the area of a circle that has a radius of 7/10 cm. use 22/7 for pi

Answers

Answer:

77/50 ≈ 1.54

Step-by-step explanation:

A=πr²

A = (22/7)(7/10)²

A = 77/50

A ≈ 1.54

PLEASE MARK IT AS BRAINLIEST

anybody understand this ? please help me .

Answers

Answer:its a or b

Step-by-step explanatio

Answer:

The answer is (2)

Step-by-step explanation:

We know that to the distance between two numbers on a number line, we subtract the smaller number from the larger number. For instance, the difference between [tex]5[/tex] and [tex]3[/tex] is simply [tex]5-3[/tex], which is [tex]2[/tex]. With that being said, variables such as [tex]p[/tex] or [tex]q[/tex] differ from a question to another. Sometimes, the [tex]p[/tex] is larger, but sometimes the [tex]q[/tex] is. If we don’t know which one is which, we can subtract them in any order and take the absolute value of that result. If the result of subtraction is positive, great! The absolute value of that is still positive ([tex]5-3=2\\|5-3|=2[/tex]) If it’s not, now it is! (e.g., [tex]|3-5|=2[/tex]! Therefore, the answer is (2) [tex]|p-q|[/tex].

Solve for X.
8=5
X 9

Answers

Answer: x = 14.4

Step-by-step explanation:

Answer:

x = 14.4

Step-by-step explanation:

8/x = 5/9     just cross multiply

5x = 8(9)

x = 72/5     divide 5 both sides

x = 14.4

Carlos is blowing air into a spherical soap bubble at the rate of 5 cm3/sec.
How fast is the radius of the bubble changing when the radius is 10 cm? (Round your answer to four decimal places.)

How fast is the surface area of the bubble changing at that time? (Round your answer to one decimal places.)

Answers

Answer:

The answer is below

Step-by-step explanation:

a) dV/dt = 5 cm³/s

The volume (V) of the bubble is:

[tex]V=\frac{4}{3} \pi r^3\\\\Differentiating\ with\ respect\ to \ time(t)\\\\\frac{d}{dt}(V)=4\pi r^2 \frac{dr}{dt} \\\\Substituting\ \frac{d}{dt}(V)=5\ cm^3/s \ and\ r = 10\ cm\\\\5 = 4\pi *10^2*\frac{dr}{dt}\\\\5=400\pi *\frac{dr}{dt}\\\\\frac{dr}{dt}=0.004\ cm/s[/tex]

b) The surface area of the sphere (A) is:

[tex]A=4\pi r^2\\\\Differentiating\ w.r.t.\ t:\\\\\frac{dA}{dt}= 8\pi r\frac{dr}{dt} \\\\r=10, dr/dt=0.004\\\\\frac{dA}{dt}= 8\pi *10*0.004\\\\\frac{dA}{dt}=1\ cm^2/s[/tex]

The rate at which the radius of the bubble is changing at that time is [tex]0.0125 \pi cm^2/s[/tex]

The rate at which the surface area of the bubble is changing at that time is [tex]\pi^2 cm^2/s[/tex]

The formula for calculating the volume of a sphere is expressed as;

[tex]V =\frac{4}{3} \pi r^3[/tex]

r is the radius of the sphere

Differentiating the volume with respect to time;

[tex]\frac{dV}{dt} = \frac{dV}{dr} \times \frac{dr}{dt} \\\frac{dV}{dt} = 4 \pi r^2\frac{dr}{dt}[/tex]

Given the following parameters

dV/dt = 5 cm^3/sec.

r = 10 cm

Substitute into the formula to get dr/dt

[tex]\frac{dV}{dt} = 4 \pi (10)^2 \times \frac{dr}{dt}\\5 = 400 \pi \times \frac{dr}{dt}\\ \frac{dr}{dt}=0.0125 \pi cm/s\\[/tex]

The surface area of the bubble is expressed as:

[tex]S = 4 \pi r^2\\\frac{dS}{dt} = \frac{dS}{dr}\times \frac{dr}{dt}\\ \frac{dS}{dt} =8 \pi r \times 0.0125 \pi\\ \frac{dS}{dt} =\pi ^2 cm^2/s[/tex]

Hence the rate at which the surface area of the bubble is changing at that time is [tex]\pi^2 cm^2/s[/tex]

Learn more here: https://brainly.com/question/12663882

Find the Surface Area:
Of the picture below


6cm
3 cm
3 cm
2 cm

Answers

Answer:

72 cm^2 OR 72 sq cm.

Step-by-step explanation:

6 x 5 = 30

10 x 3 = 30

2 x 6 = 12

30 + 30 + 12 = 72

Sorry, i don't exactly know how to explain it without drawing it. But i assure you it is correct.

After 10 years, the principal on this mortgage is $136,683. How much of the next payment will go towards interest ​

Answers

Answer: 13,668 i think.

Sales of video games and consoles fell from $1.15 million to $1.03 million in 1 year. Find the percent decrease.

Answers

Answer:100 times 7

Step-by-step explanation: because

Use the distributive property to remove the parentheses.
9(6-v)

Answers

Answer:

[tex]54-9v[/tex]

Step-by-step explanation:

To remove the parentheses by using the distributive law, we need to multiply [tex]9[/tex] to each term within the parentheses.

[tex]9(6-v) = 9(6) +9(-v)[/tex]

[tex]=54-9v[/tex]

Hope this helps :)

Three letters are randomly chosen from PROBABILITY. What is the probability that at least one of the letters is B?

Answers

Answer:

2/11

Step-by-step explanation:

thats the probability

Answer:

2/11

Step-by-step explanation:

what is 32 divided by 97

Answers

Answer:

0.32989690721

Step-by-step explanation:

Answer:

rounded to the nearest hundred: 0.33

Step-by-step explanation:

hope this helps :3

find if the series converges conditionally, converges absolutely, or diverges ∑k=1 ∞ (k^2k 3^k)/k!

Answers

Answer:

Diverges

Step-by-step explanation:

Using the ratio test to test the series:

Michelle works in the mall and her hours increase during busy shopping times of the year. Michelle has a plan to
save $45 each week for 7 weeks, and then increase that amount by $30 for the next 8 weeks during the busy time,
then go back to $45 per week. If Michelle's plan is to save $1185, how many weeks total will she need to save?
Show your work
12
II

Answers

Answer:

The total number of weeks Michelle needs to save is 29.

Step-by-step explanation:

Michelle plans to save $1185 in a number of weeks to determine later.

In the first 7 weeks, she will save $45 each week for a total of

$45 * 7 = $315

In the next 8 weeks, she will save $30 each week for a total of:

$30 * 8 = $240

During these 15 weeks, she has saved

$315 + $240 = $555

She still has a remaining $1185 - $555 = $630 to save.

Those $630 will be saved in a number of weeks at $45 per week, thus the number of weeks is:

$630 / $45 = 14 weeks

Total weeks = 15 + 14 = 29

The total number of weeks Michelle needs to save is 29.

Teresa plans to attend college in 3 years. She will need $13,600 for the first-year cost. Her uncle gave her a special gift of $10,000 to use toward the cost. How much must Teresa save each month to have enough for the first-year cost?

Answers

Answer:

100$ per month

Step-by-step explanation:

Rip king Von pop smoke quando rondo timmie and yea


Points and brainlest help me out on my question !!

Answers

Answer:

RIP to all those kings!!

Step-by-step explanation:

What is the measure of CAD

Answers

Answer:

CAD = 128

Step-by-step explanation:

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