Mathematics - 5 June 2007

Anyway, I need a little help in understanding a certain problem.

data 1: 10, 20, 25, 28, 31, 35, 37, 38, 38, 39, 39, 42, 46

data 2: 23, 39, 40, 41, 43, 47, 51, 58, 63, 66, 67, 69, 72

For data 1,
sample mean = 52.23
median = 51
standard deviation = 14.86
upper fourth (or quartile?) = 66
lower fourth (or quartile?) = 41

For data 2,
mean = 32.92
median = 37
SD = 9.93
upper fourth (or quartile?) = 39
lower fourth (or quartile?) = 28

The solutions manual and my TI-83 Plus calculator agrees with me on all those answers except the lower/upper fourths (or quartiles?).

For data 1, my calculator says:
upper quartile = 66.5
lower quartile = 40.5

For data 2, calc says:
upper quartile = 39
lower quartile = 26.5

To find fourths (or quartiles?), I generally understand about splitting your samples in one half of the lower values and the other half of higher values, and then find the median in each of those halves.

2007-06-05 12:08:18 · 1 answers · asked by Anonymous

Is there any function f(t) which images the half of a circle in the time domain more or less like this?:
(I don't mean the sinus function here)

f(t)
l
l......._---_
l..../............\ ------->this should be the half of a circle
l..l............. ..l....(the periods are only to replace the space key)
l---------------------------> t

So what the the function should do, i think, is to evaluate the distance between the diameter line (which would be t-domain line in this case) and the upper arc of the half of the circle.
Is this posible?

Thanks!!

2007-06-05 12:06:09 · 3 answers · asked by Ludovico 2

Please solve (3x+1)(4x+2) and explain.

2007-06-05 11:58:32 · 10 answers · asked by theconfuzed1 3

Add the following:

[(4-x)/(9-x^2)] + [(6)/(5x+15)]

a. (38-11x)/5(x+3)(3-x)
b. (30-10x)/5(x+3)(3-x)
c. (x+3)(x-3)/5(x+3)
d. 11(3+x)/5(x+3)(3-x)




Multiply the following:

[(2-x)/(8x-12)]*[(4x)/(x-2)]

a. x/(2x-3)
b. -x/(2x-3)
c. 2x/(2x-3)
d. x/(x-3)

2007-06-05 11:40:26 · 4 answers · asked by chicken fingers 1

2007-06-05 11:28:55 · 8 answers · asked by vietkidd88 2

can anyone differentiate this for me using the quotient rule: f(x)=2x^5 +x^2/ x. The answer is 8x+1. I get 32x^3-24x^2+2/ (2x-1)^2. Please show steps thanks!

2007-06-05 11:28:26 · 7 answers · asked by ♥stacy♥ 3

1. Of the 115 students in sixth grade 2 out of 5 belong to a drama club. How many students belong to the club?
Number sentance___________________

2. Three out of4 at highland school ordered a hot lunch today.
There are 156 students at the school. How many ordered a hlt lunch.
Number model _______________________________

3. Gina and other members of her troop sell cookies for $3 A box. For each box they sell the troop earn$1.50. One week Gina's troop sold $90 worht of cookies. how mant did they earn.
Number model _____________________________

2007-06-05 11:17:21 · 11 answers · asked by Naruto Maniac 1

2007-06-05 11:12:48 · 5 answers · asked by Anonymous

Which of the following statements has a false contrapositive and a true converse?

a) If the product of two numbers is zero, then at least one of the numbers is zero.
b) If the product of two numbers is even, then both numbers are even.
c) If a triangle is right angled, then it contains two acute angles.
d) If a rectangle has two equal adjacent sides , then it is a square.
e) If an egg is boiled for 18 minutes, then it is hard boiled.

2007-06-05 11:12:15 · 1 answers · asked by Anonymous

In Triangle ABC, if A=5, B=6, and ANGLE C =60, the value of C is?

2007-06-05 11:11:13 · 11 answers · asked by RobertH 1

2007-06-05 11:06:54 · 3 answers · asked by Anonymous

In the following diagram, ÐK = ÐN and KL = NM. Prove that ÐJLM = ÐJML (be sure to reason logically, using any theorems you know.)

picture: http://i135.photobucket.com/albums/q127/brianneee-/sgds.jpg

2007-06-05 10:52:11 · 2 answers · asked by Anonymous

The speed limit on a certain interstate highway is 70 miles per hour. Drivers caught speeding on the highway must pay a fine; the fine is caluculated using the following formula:
F= X^2-5X
WHERE F IS THE AMOUNT OF THE FINE, IN DOLLARS AND X IS THE NUMBER OF MILES PER HOUR (MPH) BY WHICH THE DRIVER'S SPEED EXCEEDED THE SPEED LIMIT.

pLEASE ANSWER THE FOLLOWING QUESTIONS.

* iF U WERE CAUGHT DRIVING 90 MPH ON THE INTERSATE, WHAT FINE WOULD U PAY

* WHAT SPPED WOULD A PERSON HAVE BEEN TRAVELING ON THE INTERSTATE IF HE OR SHE HAD TO PAY A FINE OF $176

* iN THE LAST SIX MONTHS, ANNE HAS RECIEVED TICKETS FOR DRIVING 85 MPH, 102 MPH, AND 99 MP. wHAT DOMAIN AND RANGE FOR THIS RELATION

2007-06-05 10:39:53 · 5 answers · asked by Suhena 4

2007-06-05 10:36:56 · 7 answers · asked by Anonymous

1. How many liters of water must be added to 5 liters of a 30% acid solution to obtain a 20% acid solution?

2. What property is illustrated by (x + 5) + 7 = 7 + (x + 5)

2007-06-05 10:36:10 · 5 answers · asked by Jaclyn W 1

the center of a circle has the coordinates (-1, 5) and the circles tangent to the x-axis. write an equation to represent the circle.

2007-06-05 10:32:40 · 3 answers · asked by Jasmeen 3

I'm having trouble with this problem..---

√3 times √12

(no decimals)



thanks : ]

2007-06-05 10:25:25 · 8 answers · asked by gratisfaction. 5

two years from now , jorge will be three times old as maria is now. in ten years jorge will be four times old as maria is now.
what are jorge and maria current ages?

2007-06-05 10:24:14 · 4 answers · asked by jennifer 2

Can someone explain with details on how pool in geometric terms?

2007-06-05 10:20:30 · 3 answers · asked by writer721 2

1.√8ab^4
2. 5√3÷9√3
3. 14√5-7√5
4. 2√2+2√8
5. √24+√54
6. √63-√112+√121

2007-06-05 10:20:24 · 3 answers · asked by Anonymous

2007-06-05 10:18:11 · 6 answers · asked by Anonymous

I lost my calculator can anyone tell me the square root of 306 and the square root of 169?

2007-06-05 10:02:56 · 13 answers · asked by ♥Remy♥ 5

If a rectangle has a area of 22x squared in. squared and the base is 2x in then what is the perimeter?

2007-06-05 09:52:45 · 6 answers · asked by Anonymous

x + 21 = 4 (x -6) ...i dont get it because i keep gettin a decimal

2. 6 ( 3x - 55) =2(4x =10)

3 . 5 (3x +1 ) = 2(6x + 7)

I keep gettin decmials for these equations

2007-06-05 09:51:15 · 6 answers · asked by fizzphattygurl34 1

. Consider the graph of y = tan x.
(a) How does it show that the tangent of 90 degrees is undefined?
(b) What are other undefined x values?
(c) What is the value of the tangent of angles that are close to 90 degrees (say 89.9 degrees and 90.01 degrees)?
(d) How does the graph show this?

2. A nautical mile depends on latitude. It is defined as length of a minute of arc of the earth's radius. The formula is N(P) = 6066 - 31 cos 2P, where P is the latitude in degrees.
(a) Using the Library and other course resources, find the exact latitude (to 4 decimal places) of where you live, used to live, work, or used to work (include the zip code).
(b) Using the latitude found in part a and the formula N(P), find the length of a nautical mile to the nearest foot at that location.
(c) Next, use the formula N(P) to find the latitude where the nautical mile is 6051 feet.
(d) Name two cities in the Northern Hemisphere and two in the Southern that are close to the latitude found in part c.

3. When graphed using polar coordinates, the center of a regular nonagon is at the origin and one vertex is at (6, 0 degrees) or (6, 0 radians). Find the polar coordinates of the other vertices in both degrees and radians

2007-06-05 09:37:25 · 1 answers · asked by mickey135 1

A regular octagon with sides of length 7 & an apothem of length 8.45 has an area of _____ square units?

2007-06-05 09:26:22 · 5 answers · asked by JoAnna 2

Write the expression using only positive exponents
.
15d(to the power of -9)

2007-06-05 09:14:48 · 6 answers · asked by HiImRic 2

I have a math assignement due on Fri, and I have no Idea where to start on this question. It's really important to for me to do well in this course. Please help!!

A t.v. antenna casts a shadow that is 75.0 m long. If the angle of the elevation of the sun is 39, calculate how high above the ground a blackbird perched on the top pf the antenna is.

2007-06-05 08:58:33 · 4 answers · asked by AlexMP 2

thanks...

2007-06-05 08:53:35 · 20 answers · asked by Anonymous

a. (-4, 0) (7,0)
b. (7,0) (-4,0)
c. (7,0) (0, -4)
d. (-7, 0) (0, 4)

2007-06-05 08:49:29 · 5 answers · asked by Anonymous