Mathematics - 13 August 2007

I figured out part a and C just need help with part B. Thank you

Heights of 10-year-old children are normally distributed with a mean of 52 inches and a standard deviation of 4 inches
a) Find the probability that one randomly selected 10-year-old child is taller than 54 inches

b) Find the probability that two randomly selected 10-year-old children are both taller than 54 inches

c) Find the probability that the mean height of two randomly selected 10-year-old children is greater than 54 inches

2007-08-13 10:07:47 · 3 answers · asked by Jsmith07 2

1.Find the first quartile of the data: 6, 10, 1, 8, 3, 1, 4
2.Find the second quartile of the data: 6, 10, 1, 8, 3, 1, 4
3.Find the third quartile of the data: 5, 10, 1, 8, 3, 1, 4

2007-08-13 10:02:42 · 1 answers · asked by Berry A 2

2x-4=7+x

2007-08-13 09:46:29 · 8 answers · asked by liz 2

The rate of increase of thickness of ice on a pond is inversely proportional to the thickness of the ice is x centimetres and the temperature of the air above the ice is -a degrees celcius, the rate is (ax/14400) cm/s. Form an appropriate differential equation, and hence show that, if the -10 degrees celcuis, the time taken for the thickness to increase from 5 cm to 6 cm is a little more than 2 hours.

2007-08-13 09:40:42 · 5 answers · asked by Anonymous

Referring to the figure, solve the inequality shown.
6

2007-08-13 09:35:04 · 6 answers · asked by Berry A 2

please help

2007-08-13 09:32:42 · 10 answers · asked by Anonymous

please help

2007-08-13 09:30:42 · 4 answers · asked by Anonymous

what are box and whiskers plots used for and how could u use them in every day life??? it would be really great if you could help me with this! my teacher couldnt figure out wat they were used for...so i am asking all of you at 'Yahoo! Answers' to help me with this! please and thank you!

2007-08-13 09:13:08 · 4 answers · asked by karieizzy 2

You are at the music store to buy some CDs. You have $45 to spend and
the store sells CDs for $12.99 each. Write an inequality that
represents the number, n, of CDs that you can buy without spending
more money than you have.

2007-08-13 09:08:31 · 5 answers · asked by Berry A 2

Find the radius, diameter and circumference of a circle with an area of 64 pi cm2. Write your answers as decimals rounded to the nearest hundredth.

Find the circumference and area of a circle that has a rectangle inscribed inside it with sides that are 9 by 12 centimeters. Write your answer as decimals rounded to the nearest hundredth.

2007-08-13 09:05:16 · 8 answers · asked by Anonymous

A dog weighs 10 pounds. How many 5-mg tablets are needed to provide a dose of 7.5 mg/lb to the dog?

A. 5 tablets
B. 10 tablets
C. 15 tablets
D. 20 tablets

2007-08-13 08:58:18 · 19 answers · asked by Anonymous

The union set A, B and C is {1,2,3,4,5,6,7}, the intersection of Sets A, B, and C is {0}, (empty set) and Set A= {1,2,3,4}. If Set B contains a greater number of elements than does Set C, what is the largest possible value of the sum of the elements of Set B?

any ideas on how to do this?

2007-08-13 08:56:04 · 7 answers · asked by r5091 2

a) 1 / v = 1 / u1 + 1 / u2 , find u1

b) 3^x = A, find A

c) s = ut + 1/2 (half) at^2, find a

2007-08-13 08:52:56 · 2 answers · asked by Anonymous

How many honest membes are in state assmebly?

2007-08-13 08:49:48 · 14 answers · asked by Alexander 6

this is totally confusing. I dont know what they want. The problem is For the function f(x) = x with a power of two - 2x + 1
(a) find f(0)

(b) solve f(x) = 0

Can anyone help me with this one?

2007-08-13 08:39:53 · 12 answers · asked by Roger D 1

Solve the equation.
(41)/(x) = 6 - (1)/(x)


Problem 2
Solve the equation.
(11)/(x) = 4 - (1)/(x)

2007-08-13 08:39:27 · 7 answers · asked by Anonymous

Let f: R--> R be continuous, periodic and non constant on R. Show that f has a fundamental period p >0. If f is constant, then it's trivial that f has no fundamental period. But I'm having trouble to prove the converse.

Thank you

2007-08-13 08:37:27 · 2 answers · asked by Rose 1

This is rather intuitive, but I'd like help to give a formal proof.

Suppose f:R --> R is periodic and continuous on R. Then, f is uniformly continuous on R

Thank you

2007-08-13 08:33:41 · 3 answers · asked by Rose 1

Solve the equation.

(x - 7)/ (6) = (x + 3) / (7)



Problem 2

Solve the problem.
Two angles are supplementary if the sum of their measures is 180. If the measure of one angle is given by (31x/20) and the measure of its supplement is given by ( 7x/10), find the measures of the two angles.

62, 118
80, 100
40, 140
124, 56

2007-08-13 08:28:53 · 4 answers · asked by Anonymous

2007-08-13 08:26:07 · 10 answers · asked by Diana K 1

12. Write the first six terms of each of the sequences whose nth term is
(a) ( -3) n

(b) 3 – 4n

2007-08-13 08:23:39 · 6 answers · asked by Anonymous

i need help with this one. The problem is indicate which of the following lines are parallel, perpendicular, or neither. Show your work and explain why you chose the answer that you did.
The equation is 3x + y = 5
x + y = 3

2007-08-13 08:16:35 · 7 answers · asked by Roger D 1

If t is, how can we prove?
Thank you

2007-08-13 08:09:41 · 1 answers · asked by Edson 1

2007-08-13 08:05:57 · 9 answers · asked by Frits R 2

Hugo’s checking account at the beginning of the month had a balance of $250. During the month he wrote five checks for $15, two checks for $12, and one check for $107. He made one deposit for $62. What is
his new balance?

2007-08-13 08:04:44 · 6 answers · asked by Chase L 1

hours. what was his speed each way.

2007-08-13 08:01:51 · 5 answers · asked by sugar lady 1

Identify the whole number property illustrated in each of the following.
4 + (7 + 3) = 4 + (3 + 7)

5 • 1 = 1 • 5

5 • (5 • 6) = (5 • 5) • 6

4 • (5 + 6) = (4 • 5) + (4 • 6)

2007-08-13 07:59:08 · 3 answers · asked by Chase L 1

Write the number preceding and succeeding each of the following.

(a) EET twelve ______________ ________________

(b) 10011 two ______________ ________________

If 2b six = 17 eight, what is the value of b? _______________

2007-08-13 07:55:51 · 1 answers · asked by Chris 1

2007-08-13 07:48:22 · 6 answers · asked by Mercedes 1

1. put the function in the form P=Poe^kt
P=132(0.2)^t
Po=?
k=?

2.find a solution to the equation if possible.
1=10cos(3x+1)-4

3.nikki invested 12000 in the stock market. it was a loser declining in value 10% eah year for 10 years.how much was the investment worth after 10 years?(exponential function)

after 10 years the stock began to gain value at 10% per year. how long will it take for the investment to regain original value?

4.a town connected to a water supply is billed a fixed amount yearly plus a charge fir each cubic foot of water used. a household using 1000 cubic feet was billed $80 and one using 1600 cubic feet was charged 115.

what is the charge per cubic foot?
write an equation for c, the total cost of a residents water as a fuction of w cubic feet of water used.
how many cubic feet of water used would lead to a bill of $160

5. P=15e^0.85

P=Po(a^t)
what are the values of Po and a?
does this function represent growth or decay?

please explain answers!

2007-08-13 07:43:36 · 1 answers · asked by Anonymous