Mathematics: Post your doubts here!

[abdul moeed rana]

Hey everyone!
I have a question which is confusing me, can anyone answer that for me... explain me the steps to go thru.
In a group of 100 people, 40 own a cat, 25 own a dog and 15 own a cat and a dog. Find the probability that a person chosen at random:
(i) owns a dog or a cat [Answer: 0.5]
(ii) owns a dog or a cat but not both [Answer 0.35]
(iii) owns a dog given he owns a cat [Answer 0.375]
(iv) does not own a cat given that he owns a dog [Answer 0.4]
Thank you

wat does the phrase ,within 1 standard deviation of the mean means????

 

[abdul moeed rana]

hey guys I'm new here, just joined few days ago, Nice to meet all of you
Can i get a little help on Question 6 (iii)? I don't quite get the marking scheme I really am bad in P & C Someone help me!

wat does the phrase within 1 stadard deviation of the mean ....,means??

 

[Thought blocker]

wat does the phrase,"within 1 standard deviation of the mean" means????
please reply !!!have cie exam 2morrow

http://en.wikipedia.org/wiki/Standard_deviation

 

[Biocalife]

someone explain me why the negative sign behind 2.15 on question 7 of nov 2009 (62) also the last question why we take p as 0.7623 and not 0.2377 ???

 

[abdul moeed rana]

http://en.wikipedia.org/wiki/Standard_deviation

it didnot help??
please help
i'm freakin out

 

[Thought blocker]

it didnot help??
please help
i'm freakin out

That's what I can say, I am busy into other doubts.
Gimme ur skype id.

 

[abdul moeed rana]

That's what I can say, I am busy into other doubts.
Gimme ur skype id.

am not on skype,am on [email protected]
if this help
please i just want to know this one thing only!!

 

[Thought blocker]

am not on skype,am on [email protected]
if this help
please i just want to know this one thing only!!

If u can be online for long time, RoOkaYya G will tell you.

 

[abdul moeed rana]

If u can be online for long time, RoOkaYya G will tell you.

i think i know that name,
right now i'm online on gmail
but please i hav exam tomorrow,just tell me this one thing,i dont want to understand the whole chap or anything
see mj 14 paper 61 ,u'll hav the qs i'm asking u

 

[Thought blocker]

i think i know that name,
right now i'm online on gmail
but please i hav exam tomorrow,just tell me this one thing,i dont want to understand the whole chap or anything
see mj 14 paper 61 ,u'll hav the qs i'm asking u

No. I have just started my preparations on s1
I just know something so I am asking u to ask rookz about it. She will come.

 

[abdul moeed rana]

No. I have just started my preparations on s1
I just know something so I am asking u to ask rookz about it. She will come.

wats that suppose to mean??

 

[Thought blocker]

wats that suppose to mean??

Just wait n watch.

 

[abdul moeed rana]

Just wait n watch.

paper leak sheak ka scene.....
is that wat u r sayin

 

[abdul moeed rana]

Just wait n watch.

where is she,is she online??

 

[RoOkaYya G]

paper leak sheak ka scene.....
is that wat u r sayin

paper leak?

 

[RoOkaYya G]

wat does the phrase within 1 stadard deviation of the mean ....,means??

means sigma
if it says "within 2 sd of mean" then its 2 sigma

 

[abdul moeed rana]

means sigma
if it says "within 2 sd of mean" then its 2 sigma

can u please solve the qs in mj 14 p 61.there is one qs in this paper.it is q4 or 5 i think,plzzz solve

 

[abdul moeed rana]

means sigma
if it says "within 2 sd of mean" then its 2 sigma

can u please giv me an example

 

[RoOkaYya G]

can u please solve the qs in mj 14 p 61.there is one qs in this paper.it is q4 or 5 i think,plzzz solve

give link ill see if i can help

 

[RoOkaYya G]

can u please giv me an example

jst like u calculate sd normally. thts it.