Help with probability!

aisha00 · 2010-12-10 00:48:01

I hav an exam on Sunday, and while studyin for it I came across a few questions that i cudn't solve. I'd be grateful if sum1 could help me wid them. Thank you.

5)Find the probability that if 5 different-sized washers are arranged in a row, they will be arranged in order of size

The answer is 1/60

6)All holy plants are dioecious-a male plant must be planted within 30 to 40 feet of the female plant in order to yield barriers. A home improvement store has 12 unmarked holly plants for sale, 8 of which are female. If a homeowner buys 3 plants at random, what is the probability that berries will be produced?

The answer is 0.727.

DrSteve · 2010-12-10 01:44:03

5) There are 5! = 5*4*3*2*1 = 120 ways to arrange the washers. Two of these ways will be in size order (smallest to largest, and largest to smallest). So the answer is 2/120 = 1/60.

Last edited by DrSteve (2010-12-10 01:45:24)

bobbym · 2010-12-10 02:58:10

Hi aisha00;

Welcome to the forum!

6) The answer is 8 / 11 so .727 is correct.

aisha00 · 2010-12-10 03:29:04

I know its correct, i just dunno how they got it ? Thanx

bobbym wrote:

Hi aisha00;
Welcome to the forum!
6) The answer is 8 / 11 so .727 is correct.

aisha00 · 2010-12-10 03:31:32

Thanx

DrSteve wrote:

5) There are 5! = 5*4*3*2*1 = 120 ways to arrange the washers. Two of these ways will be in size order (smallest to largest, and largest to smallest). So the answer is 2/120 = 1/60.

bobbym · 2010-12-10 03:53:17

Hi aisha;

In order for the plants to produce berries there has to be at least 1 female and 1 male. So all females and all males are out. So work the problem from what you do not want, 3 males or 3 females.

Sandy262727 · 2012-06-01 08:16:09

HELP!!!!
A home improvment store has 13 unmarked holly plants for sale, 7 of which are female. If a homeowner buys 6 plants at random, what is the probability that barries will be produced?

bobbym · 2012-06-01 08:17:52

Hi Sandy262727;

Welcome to the forum. Do you need a male and a female plant to have berries?

sandy262727 · 2012-06-01 08:21:52

Yes P(at least one male and one female)

sandy262727 · 2012-06-01 08:25:26

I have no idea how to solve it Please

bobbym · 2012-06-01 08:31:46

Hi sandy262727;

I am getting:

sandy262727 · 2012-06-01 08:37:39

HOw did you get that? are you sure?

anonimnystefy · 2012-06-01 08:38:36

Hi Sandy

The probability that there will be only male plants is:

and the probability that there will be only female plants is:

and the probability that there will be at least one male and one female plant is:

Last edited by anonimnystefy (2012-06-01 08:40:01)

bobbym · 2012-06-01 08:39:54

Hi sandy262727;

I used the hypergeometric distribution. Do you need to see the calculation?

Sandy262727 · 2012-06-01 08:41:58

I see what your doing thank you so much and yes if you'd be so kind as to show me

bobbym · 2012-06-01 08:50:17

Hi;

sandy262727 · 2012-06-01 08:50:25

will it be the same as 0.995?

bobbym · 2012-06-01 08:51:31

Yes, it will.

sandy262727 · 2012-06-01 08:56:00

Thanks its for my hW. I wonder do you also know how to solve this one?

In a game of math using two dice, the "Dont Pass" bet is a push (tie) if the total is 12. what is the probability that it is a tie?
P(sum of 12)= ?

bobbym · 2012-06-01 08:56:49

Probability of throwing a die and getting 12?

sandy262727 · 2012-06-01 08:59:28

Sorry A game of" math". And what is the probability of that the sum of 12 is a tie?

bobbym · 2012-06-01 09:01:24

To throw two dice and get a 12:

anonimnystefy · 2012-06-01 09:02:19

Hi bobbym

I am sure you meant

.

bobbym · 2012-06-01 09:03:54

Yes, you are not waiting for me to fix my posts. I always clean them up as you can see. Takes awhile.

sandy262727 · 2012-06-01 09:04:48

so is the answer 1/6 or 1/36?

Math Is Fun Forum

#1 2010-12-10 00:48:01

Help with probability!

#2 2010-12-10 01:44:03

Re: Help with probability!

#3 2010-12-10 02:58:10

Re: Help with probability!

#4 2010-12-10 03:29:04

Re: Help with probability!

#5 2010-12-10 03:31:32

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#6 2010-12-10 03:53:17

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