## osanseviero 2 years ago In a group, the 80% is married. 75% of the married have a work. 5% does not have a work and are not marrid

1. osanseviero

What percentage does not have a work?

2. osanseviero

25% I think

3. osanseviero

|dw:1383266857976:dw| Is that right?

4. osanseviero

The last 25% is without

5. HawkCrimson

actually i got a different answer, we know this much 80% = married 75 % = married and work 5% = married and do not work from this we know that out of the 80% of the people, only 5% do not have a job. so now let look at the remaining 20% of non married people

6. HawkCrimson

we know this much 5% = people who arent married and do not work so far this is all be know from the info provided but the question doesnt mention anything about the remaining 15% but, we can reason out that the 15% much be people who are not married but work there fore 15% = not married but work

7. HawkCrimson

finally, out of the 80% of married people, only 5% do not have jobs and out of the 20% of single people only 5% do not have job. to conclude, there are a total of 10% of people that do not have jobs, 10% is ur answer

8. HawkCrimson

i am sorry that it was so long but i hope that you understood it, any questions?

9. osanseviero

But the problem says Married: 80% (of the total) With work: 75% (of the married, so this is 75% of 80, so it would be a 60% of the total) Without a work: 5% (of the total, so itwould be 25% of a 20%) Single: 20%

10. osanseviero

I am right until there?

11. HawkCrimson

|dw:1383269057108:dw|

12. osanseviero

Ok, perfect, so a 10% has no work

13. osanseviero

wait

14. osanseviero

But the 75% apply to the married people, so it is 75% of 80%, (60)

15. osanseviero

|dw:1383269250683:dw|

16. HawkCrimson

ok and the 5% does not have a work and are not marrid, is that 5% of 100%? or something else?

17. HawkCrimson

the quesiton doesnt specify if that 5% is of the 100% or the remaining 20%

18. osanseviero

"Finally, 5% are not married and neither have a work" I think it is of the 100%

19. HawkCrimson

i agree with you that it's 75% of 80%, ill change that now, but before i do, i would think 5% of 100% as well

20. HawkCrimson

yea i think it's 25% as well, sry for mis reading the question

21. HawkCrimson

but atleast u got a 2nd opinion in the end!

22. osanseviero

Hahaha thanks :)

23. osanseviero

The hard question is: if one person has a work, which is the probability of him being married

24. osanseviero

$P(A\B) = \frac{ P(A intersecting with B)}{ B }$

25. osanseviero

Is that useful for this one?

26. HawkCrimson

im not familiar with that equation, but ik you dont need it, it can be reasoned out

27. osanseviero

P(A)=3/4 (probability of being married P(B)= 3/4 (probability of having a job)

28. osanseviero

Mmm...75% of the 75%

29. osanseviero

or 75% of 60%

30. HawkCrimson

im a calc student so idk statistic equations lol but ik that i can reason it out lol 1 sec

31. HawkCrimson

id say 60% are married and work, 15% arnt married but work. there fore we find 60/75 x 100 and that should give us our answer

32. HawkCrimson

i got 80%

33. HawkCrimson

wait

34. osanseviero

Ok

35. HawkCrimson

yep i got 80%

36. osanseviero

Can you explain me again the logic? You want to calculate the 75% of the 60%, but why?

37. HawkCrimson

kk, i did it in a calculus way though xD but u seem smart enough to understadn it :) Let x = total number of people y = 75% of x (number of people working) and let z = 60% of x (number of people married and working) therefore z/y times 100 = the percentage of married and working compared to just working)

38. HawkCrimson

therefore z/y of 100 = 60% of x / 75% of x times 100 the x cancels so 60/100 / 75/100 times 100 60/75 times 100

39. HawkCrimson

if that makes sense xD

40. HawkCrimson

does that make any sense?

41. osanseviero

Yes :D thanks

42. osanseviero

The last question is what percentage is married inside the ones that does not have a job

43. osanseviero

So... 75-100 x-80 Can that apply? 80*75 divded by 100

44. osanseviero

I mean x-25

45. osanseviero

Let me formulate that again

46. osanseviero

x=total y=75% of x z=25% of x

47. osanseviero

75/25=3*

48. HawkCrimson

in this case x = total y = 25% of x (people with no jobs) z = 20% of x (people who are married and do not have a job) z/y times 100 = 20/25 times 100 = 80%.. wait, again? O.o

49. HawkCrimson

i dont see anything wrong with it, wat do you think? looks right to me

50. osanseviero

Looks good o.O

51. HawkCrimson

lol it's just fishy but yea xD

52. osanseviero

Do you want with another question? :) (similar problem)

53. osanseviero

Btw, thanks a lot

54. HawkCrimson

yea sure, how many questions do you have to do?

55. osanseviero

One problem more :) but it has 4 questions

56. HawkCrimson

btw, do you have to show working? cause i can bet ur teacher would of wanted you to of solved it a different way xD

57. HawkCrimson

but sure, u can post the last question as a new topic

58. osanseviero

Probably he wanted...but he is happy if he sees us having any way. He likes us to be independent. I will post next one

59. HawkCrimson

kk, but still id be nice to learn another way cause this way is tedious. probably there is an equation that would of made all of this simple