||Homework Help||Kindergarten-University. - Page 7

akhl

@akhl

IF-Rockerz

Posted: 12 years ago

@reemz.malik

Mean = $66,570
Median = $48,201

Reason: The distribution is skewed to the right. Therefore, there is tail to the right of the mean. Therefore, more than 50% of data points are to the left of the mean i.e. mean is to the right of more than 50% of data points.
Therefore,mean is to the right of median i.e. mean > median

Median is better to use because the data are skewed.

I will post the other parts sometime tomorrow.
Edited by akhl - 12 years ago

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reema

@reemz.malik

IF-Rockerz

+ 3

Posted: 12 years ago

@akhl - Thank you so much. I was just trying to do this thing but I was just a bit confused between which one is mean and which one is median. I kind of got it how to do it now...thanx again :D

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komal

@scarlet.moon

IF-Sizzlerz

+ 4

Posted: 12 years ago

This content was originally posted by: reemz.malik
I need help in math :/

I am not a math person so yeah am really bad at it -_-

This is math108 All practice purposes (Kind of a business math)

Here is what I have to do..

The distribution of income in the United States is skewed to the right. According to a Census Bureau report, the mean and median incomes of American households were $48,201 and $66,570 in 2006. Which of these numbers is the mean and which is the median? Explain your reasoning. Which of these numbers (mean or median) are better to use when talking about the average US income? Give another example where there is a large difference between mean and median. Give examples when it is better to use mean and when it is better to use median.

It's due on monday...so help asap!

$48,201 is the median where as $66,570 is the mean because there are few Americans who make a lot of money annually hence making the mean higher than the median. When talking about the average U.S. income it's better to use the median because the mean also includes the high salary of few Americans so it won't give you an accurate result.

One of the examples where the mean and the median has a large difference can be the starting salaries of a graduating class from college. Not everyone will get have same or close to same salaries like a doctor will have a higher salary then an engineer. A sport player like in NBA, MLB, NFL will have a higher salary range hence the larger difference. It is better to use the median for accurate result here.

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reema

@reemz.malik

IF-Rockerz

+ 3

Posted: 12 years ago

@Komal - Thanx a lot. That really helped I might use similar example :D

Am so glad IF opened up Homework help...or else math would have made me crazy 😆

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596277

Posted: 12 years ago

Physics Question - - - - Period and Frequency

What is the period of the minute hand of a clock?

Formula for Period is time/cycle

The formula is confusing me now, cause I believe the answer is 3600s, but I only get that by multiplying 60 by 60, and if I do it that way, then Im not following the formula, so how exactly do I do this?

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akhl

@akhl

IF-Rockerz

Posted: 12 years ago

@Ayeshaa,
The minute hand completes one revolution in 1 hour i.e. 3600 s
This means if cycle = 1, then time = 3600 s
Period = 3600 s/1 = 3600 s

You can also say that period is the time taken to complete one cycle.

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596277

Posted: 12 years ago

^^ Thanks so much buddy =)

I have one last question on this Physics worksheet, and I even asked the sub about it, and she was confused.

The crankshaft of a car engine is turning at 3.6*10^2 r/min. Four of its eight spark plugs fire during each revolution, at equal time intervals. The coil provides that spark for all the plugs.

A) How many sparks does the coil produce per second?

b) What is the time between sparks?

I just don't get how to do this, the "four out of eight" thing confuses me:\

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akhl

@akhl

IF-Rockerz

Posted: 12 years ago

@Ayeshaa, in 4 our of 8, only 4 is important because 4 sparks fire in one revolution.

a) (3.6 * 10^2 r/min) * (4 sparks/r)
= 3.6 * 10^2 * 4 sparks/min
= 3.6 * 10^2 * 4/60 sparks/second
= 24 sparks/second

Ans: 24

b) For sparks, frequency = 24 s^-1
Time between spakrs = period = 1/frequency = (1/24) second
If you want to write in decimal, then the answer is
4.2 * 10^-2 second

Edited by akhl - 12 years ago

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596277

Posted: 12 years ago

^^ Thanks:) I'll go over what you did, and If I still don't understand it, then I'll ask you.

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596277

Posted: 12 years ago

This content was originally posted by: akhl
@Ayeshaa, in 4 our of 8, only 4 is important because 4 sparks fire in one revolution.

a) (3.6 * 10^2 r/min) * (4 sparks/r)
= 3.6 * 10^2 * 4 sparks/min
= 3.6 * 10^2 * 4/60 sparks/second
= 24 sparks/second

Ans: 24

b) For sparks, frequency = 24 s^-1
Time between spakrs = period = 1/frequency = (1/24) second
If you want to write in decimal, then the answer is
4.2 * 10^-2 second

Okay just want to ask that you did you use a specific formula for part a? And also where did you get the -1 from in part b?

--Sorry I just don't really get this stuff:\

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