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Mathematics: Post your doubts here!

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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????
 
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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??
 
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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 ???
 
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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 :p
I just know something so I am asking u to ask rookz about it. She will come. ;)
 
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