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Probability-and-statistics/370273: In a casino game, a player is given three numbers from 1 to 3. That is, he is given 1, 2, or 3, then again 1, 2, or 3, and then a third time 1, 2, or 3. Write out the sample space. What is the probability that the player will receive three different numbers?
1 solutions
Answer 263902 by edjones(7569)   on 2010-11-12 21:25:02 (Show Source):
You can put this solution on YOUR website!(111) (112) (113)
(121) (122) (123)
(131) (132) (133)
I did all the permutations of the set of numbers beginning with one in the sample space to give you the idea of what the sample space should look like.
There are 3^3=27 groups of 3 numbers in all. You can do the other 18.
As you can see 2/9 is the probability that the player will receive three different numbers.
.
Ed
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Probability-and-statistics/370256: According to the bureau of the census, the following statistics describe the number (in thousand) of young adults living at homr or in a dormitory in the year 2004.
ages 18-24 ages 25-34
--------------------------
male 7922 2543
female 5779 995
choose one student at random. Find the probability that the student is
a. a female student aged 25-34
b. Male or aged 18-24
c. Under 25 years if age and not male
1 solutions
Answer 263898 by edjones(7569) on 2010-11-12 20:39:50 (Show Source):
You can put this solution on YOUR website!17,239 total students.
a) 995/17239=.0577
.
b)
Male: 10465
female 18-24: 5779
(10465+5779)/17239
=.9423
.
c)
5779/17239
=.3352
.
Ed
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Probability-and-statistics/370130: There are ten lottery tickets, two of which are winners. Find the probability that in a sample of 6 tickets there will be no more than one winning ticket.
1 solutions
Answer 263885 by edjones(7569) on 2010-11-12 19:51:24 (Show Source):
You can put this solution on YOUR website!nCr=combinayion of n things taken r at a time.
((8C5 * 2C1)+(8C6))/10C6
=((56*2)+28)/210
=2/3 the probability that in a sample of 6 tickets there will be no more than one winning ticket.
.
Ed
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Probability-and-statistics/370140: There are ten lottery tickets, two of which are winners. Find the probability that in a sample of 6 tickets there will be no more than one winning ticket.
1 solutions
Answer 263884 by edjones(7569) on 2010-11-12 19:43:58 (Show Source):
You can put this solution on YOUR website!nCr=combinayion of n things taken r at a time.
((8C5 * 2C1)+(8C6))/10C6
=((56*2)+28)/210
=2/3 the probability that in a sample of 6 tickets there will be no more than one winning ticket.
.
Ed
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Probability-and-statistics/369923: A computer prints out three digits chosen at random from 0 to 9, inclusive. Find the probability that:
a) All three digits are different.
b) The third digit differs from the first two digits.
Thank yoy very much for your answer!
1 solutions
Answer 263604 by edjones(7569) on 2010-11-11 22:15:39 (Show Source):
You can put this solution on YOUR website!a) 10/10 * 9/10 * 8/10 = 720/1000 = 18/25
.
b)
((8/10 * 9) + 9/10)/10 Because of a 1/10 chance both of the first 2 digits are the same.
= (72/10 + 9/10)/10
= 81/100
.
Ed
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Permutations/369747: Aunt Rose has a children's table for Thanksgiving dinner. There are 4 children. For chairs she has a small bean bag, a small rocking chair, a stool, and a little desk chair. How many different ways could she seat those 4 children at the table?
1 solutions
Answer 263503 by edjones(7569) on 2010-11-11 18:08:24 (Show Source):
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Probability-and-statistics/369692: In a survey of 150 seniors executives, 47% said that most common job interview mistake is to have little or no knowledge of the company. I need help with part B
a) If 6 of those surveyed executives are randomly selected without replacement for a follow-up survey, find the probability ... b) If part (a) is changed so that 9 of the surveyed executives are to be randomly selected without replacement, explain why the binomial probability formula cannot be used.
1 solutions
Answer 263446 by edjones(7569) on 2010-11-11 15:58:51 (Show Source):
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Linear-systems/369660: Can you help me with this problem please? 2u+v=9
u/2 -1/2=-v
I have to solve it using elimination but every time I try to check my solution it comes out incorrect. Can you help me please? I would really appreciate it! Thank you!
1 solutions
Answer 263421 by edjones(7569) on 2010-11-11 15:25:58 (Show Source):
You can put this solution on YOUR website!2u+v=9
.
u/2 -1/2=-v
u-1=-2v multiply each side by 2.
u+2v=1
-2u-4v=-2 multiply each side by -2.
.
2u+v=9
-2u-4v=-2
-----------add
-3v=7
.
v=-7/3
u=17/3
.
Ed
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test/369666: Erin, Molly, Jillian and Brendan go to the carnival
They have pink, blue, green and red cotton candy. How many different combinations can there be?
1 solutions
Answer 263419 by edjones(7569) on 2010-11-11 15:07:56 (Show Source):
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logarithm/369662: Solve the following to the nearest hundredth.
I am only able to get this problem so far, then I get stuck. This is what I have done so far:
I am not sure as to what the next step in solving this problem is, the three at the beginning of the 3log6 is my issue with solving this equation
1 solutions
Answer 263418 by edjones(7569) on 2010-11-11 15:01:09 (Show Source):
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Probability-and-statistics/369654: Enrollment statistics at a certain college show that 55% of all students are men, 18% of the student body consists of women majoring in business, and 40% of all students major in business. A student is selected at random.
Find the conditional probability that the person majors in business if we are certain the person is a woman.
I've got P(men) = 55 and P(women majoring in business) = 18, but the 40% I do not know what to do. I tried Venn diagram and:
P(M U W) = P(M) + P(W) - P(M n W) I still cannot get answer..
1 solutions
Answer 263416 by edjones(7569) on 2010-11-11 14:56:07 (Show Source):
You can put this solution on YOUR website!Make a Venn diagram of Women and Bussiness majors.
P=P(WnB)|P(W)(.18/.45=.40 the conditional probability that the person majors in business if we are certain the person is a woman.
.
Ed
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Average/369651: Hi. I hope you can help me. This is for 10th grade regents math homework. Here is the quesion. "Through a given point P, on a plane, how many planes can be drawn that are perpendicular to that plane?"
A) 1
B) 2
C) infinitely many
D) none
Please email the answer to me and if you can explain how you got it. Thanks :)
1 solutions
Answer 263411 by edjones(7569) on 2010-11-11 14:45:35 (Show Source):
You can put this solution on YOUR website!D) none
The plane is the paper the dot is on. Since all line draw must be in the plane of the paper, none can be perpendicular to it.
.
Ed
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Equations/369646: Im really stumped on how to find the answer to these two equations:
2x=x/5+28
2(x+8)=3-(4x-7)
Can you please help me solve these! Thank you!!
1 solutions
Answer 263406 by edjones(7569) on 2010-11-11 14:40:45 (Show Source):
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Human-and-algebraic-language/369576: A group of stockholders are to elect a president, vice-president, secretary, and a treasurer from 6 board members who qualify. How many different ways can the officers be elected?
1 solutions
Answer 263405 by edjones(7569) on 2010-11-11 14:35:32 (Show Source):
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Permutations/368468: A committee of 5 people is selected from a group of 8 men and 9 women. In how many ways can the committee be selected so it contains at least one woman?
1 solutions
Answer 263403 by edjones(7569) on 2010-11-11 14:18:23 (Show Source):
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Permutations/369622: A test consists of 10 true-or-false questions. If a student randomly chooses answers for each question, find the probability that the student:
Answers at least 1 question correctly. (3 decimals)
I got 2^10 = 1,024
I did this way, but does not work, very close...
C(10,1)/1024 =
10/1024 = .00976
The answer is 0.999 but how?
1 solutions
Answer 263399 by edjones(7569) on 2010-11-11 14:09:41 (Show Source):
You can put this solution on YOUR website!Let x=.5 probability of getting a problem wrong.
1- probability that he gets them all wrong = the probability that the student answers at least 1 question correctly.
1-.5^10=.9990
.
Ed
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Triangles/368864: Find the area of an equilateral triangle (regular 3-gon) with the given measurement.
6-inch apothem
A = sq. in
1 solutions
Answer 262837 by edjones(7569) on 2010-11-10 00:09:03 (Show Source):
You can put this solution on YOUR website!There are now two 30-60-90 triangles with side ratios of 1:sqrt(3):2
Let b=base
b/1=6/sqrt(3) Proportion
A=0.5*6*(6/sqrt(3))
=18/sqrt(3)
=18/sqrt(3) * sqrt(3)/sqrt(3) Rationalize the denominator.
=18sqrt(3)/3
=6sqrt(3)
.
Ed
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Probability-and-statistics/368773: Which of the following statements are correct?
a. A normal distribution is any distribution that is not unusual.
b. The graph of a normal distribution is bell-shaped.
c. If a population has a normal distribution, the mean and the median are not equal.
d. The graph of a normal distribution is symmetric.
1 solutions
Answer 262828 by edjones(7569) on 2010-11-09 23:42:27 (Show Source):
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Probability-and-statistics/368065: Three cards are drawn from an ordinary deck of 52 cards without replacement. What is the probability that the second and third cards are spades if the first card was not a spade?
1 solutions
Answer 262324 by edjones(7569) on 2010-11-08 19:46:37 (Show Source):
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