Mathematics - 14 September 2007

Into two brackets

2007-09-14 04:14:20 · 10 answers · asked by Anonymous

(i) A coffee-maker is regulated so that it takes an average of 5.8 min to brew a cup of coffee with a standard deviation of 0.6 min. According to Chebyshev's theorem, what percentage of the times that this coffee-maker is used will the brewing time take anywhere from 4.6 min to 7 min.
(ii) Give your reason why the Chebyshev's theorem is applied in part (i).
(iii) Do you think that the percentage found in part (i) is accurate? Please explain.

2007-09-14 03:49:05 · 2 answers · asked by sky_blue 1

In Hungary (population: 10 million) there is a chance to win an Apple Macbook. You have to buy a kind of beer :) and on the back of the label of each bottle there is a code that you can send in through the internet.

Before the game started, a computer randomly selected two dates (days, hours, minutes, maybe seconds as well) a week. If you send your code exactly at the selected times, or you are the first after the selected dates, you win (i.e. you can win two Macbooks every week).
This game lasts for four more weeks. The beer is Stella Artois, which is relatively expensive here, so it is not for the masses.

I am curious, how many codes do I have to send them every day so it becomes VERY likely that I win a Macbook?

2007-09-14 03:46:05 · 2 answers · asked by junglesgal 3

How much is this £125.00 in American dollars?

2007-09-14 03:27:16 · 9 answers · asked by Va princess 4

can someone explain to me how to manipulate the equation for speed

and also. circumference only applies to circles right?

2007-09-14 03:07:24 · 9 answers · asked by Anonymous

tanya
554/16
faridabad,haryana

2007-09-14 02:41:21 · 5 answers · asked by Tanyas 1

I'm sorry.....
I'm really stupid in math so please help me with this math problem!

You have an equal number of nickels, dimes, and quarters with a total value of $6.00. How many of each coin do you have?

a. 3
b. 10
c. 15
d. Not Here

2007-09-14 02:22:15 · 6 answers · asked by WoWzErZ 1

Which are the values of "k" ,k belongs (is included) in R..for wich the innequation x^2 - (k-3)*x - k+6 < 0 has no solutions ?

2007-09-14 02:01:00 · 2 answers · asked by dragoi_adrian_hd 1

We have 3mx^2+(2m + 1)*x + m+1=0,m is included in R and we have X1 and X2,the roots of the equation.Determine an independent relation from m (of m) between the roots X1 and X2. Hope u understood what I said here :)
Thank you!

2007-09-14 01:55:01 · 2 answers · asked by Dragoi V. 1

Find all roots of the polynomial P(x) = x^ 4 + 9.

a. (±√ 3 ± i √3)/2

b. (−√ 6 ± i √6)/2

c. ± √3i and ±√ 3

d. (± √6 ± i √6)/2

e. (± √3 ± i √6)/2

2007-09-14 01:48:28 · 2 answers · asked by Anonymous

Find all rational roots of the polynomial:
P(x) = 5 x ^4 - 27 x ^3 + 40 x ^2 - 22x + 4 , then find the
irrational roots, if any.

a. 2/5, 1, and 2 ± √2
b. 2/5 and 1 ± √2
c. -1/2, 1/4 and (3 ± √5)/2
d. 1/3 and 1
e. -2/3 , 5/2 and 3 ± √3

2007-09-14 01:47:57 · 3 answers · asked by Anonymous

Find all rational roots of the polynomial:
P(x) = 2/3x ^6 - x ^5 - 13/3x^ 4 + 29/3x^ 3 - 9 x ^2 + 32//3x - 4 , and then find the irrational roots, if any.

a. -3, 1/2, and 2
b. -3, -1/2, and 1
c. 1, 2, and 5/2
d. 2/3, 4/3, and 2
e. -1/2, 1, and 3

2007-09-14 01:32:17 · 1 answers · asked by Anonymous

A furlong, a measure of distance used in horseracing, is defined as 201.168 meters. What is the distance in feet of the Kentucky Derby, which is a 10-furlong race? Use the conversion: 1 inch = 2.54 cm.

2007-09-14 01:17:53 · 2 answers · asked by Anonymous

x , y , z = ?
( 7 / x + y )=( 6 / x + z )=( 9 / y + z )
and ( x + y )( Y + z )( z + x ) = 24192

2007-09-14 00:53:58 · 1 answers · asked by dragoi_stefan06 2

My friend and I have recently begun an email correspondence. Every weekend we send each other a question in our area of expertise. While I do posses a very logical mind, I am by no means a great mathematician, he is. This week his question to me was: "Why is an equation that contains a number divided by zero undefined?"

The answer I came up with is: "An equation containing a number divided by zero is undefined for it compromises the validity of known mathematical laws."

In explanation: "If we take the fraction 4/2. We know for a fact that this is equal to 2. We should therefore be able to reverse the process and come to the logical conclusion that 2x2 is equal to 4. In contrast take the fraction 5/0, the two most logical guesses at the solution to this fraction would be 5 and 0. When trying to reverse the process we come to 5x0 and 0x0 respectively. Neither of which equal the original fraction 5/0. This constitutes an inconsistency in mathematical law."

2007-09-14 00:50:18 · 4 answers · asked by Anonymous

Augustus De Morgan, an English mathematician who lived in the 19th century, once said, "I was x years old in the year x2". He was born in 1806. A different person, born in the 20th century, will be x years old in the year x2. In what year was the person born?

2007-09-14 00:49:43 · 2 answers · asked by Manoura 2

Find the Tangents
y=x^3-2x^2+x+5
find the equation for the tangents when y=5

2007-09-14 00:30:24 · 3 answers · asked by Anonymous

a , b ,c (this numbers are not zero) ....invers proportional...5 , 6 ,10 and (a^2 + b^2 + c^2 / abc) = 14 / 18
/ - fraction line
^ - means raised to ....

2007-09-14 00:21:42 · 1 answers · asked by dragoi_stefan06 2

2007-09-14 00:13:50 · 10 answers · asked by sin03 1

area of circle = (pi)*r*r
where,
pi=3.14
r=radius of the circle

How to arrive at this formula using the simplest method?

2007-09-14 00:01:56 · 6 answers · asked by janaaaa 2