Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

aussy123

  • one year ago

Matching probability question help! Medal Rewarded!!

  • This Question is Closed
  1. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    In a group of 100 persons, 85 had Rh positive blood (Rh factor present), 45 had Type O blood, and 38 had both type O and Rh positive blood. If one person had been selected at random from the group, what would the probability be: 1. that his blood type was Type O and Rh+? A. 3 /20 2. that his blood type was not O? B. 17/20 3. that his blood type was Rh-? C . 93/100 4. that his blood type was Type O and Rh-? D. 11/20 5. that his blood type was Rh+? E. 7/100 6. that his blood type was not Type O or else was Rh+? F. 19/50

  2. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    a venn might be usefull

  3. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    whats that

  4. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    its a diagraham that defines sets with circles

  5. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh where can I find it

  6. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    |dw:1366391420781:dw|

  7. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh

  8. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    |dw:1366391462898:dw|

  9. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    if we add the 3 sections we get: 85+45-38 = 92 so there must be 8 people in the setup that had neither Rh or O

  10. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok..Im following

  11. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    |dw:1366391683621:dw|

  12. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    this helps us define the numbers involved and the combinations that they ask for

  13. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    1. that his blood type was Type O and Rh+? A. 38 /100 2. that his blood type was not O? B. (100 - 45)/100 3. that his blood type was Rh-? (not RH) C. (100 - 85)/100 4. that his blood type was Type O and notRh? D. 45/100 * C 5. that his blood type was Rh+? E. 85/100 6. that his blood type was not Type O or else was Rh+? F. B + E

  14. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    One question just so I know Im reading the diagram right. Is Rh. n. O , Rh.NOT.O?

  15. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    there are 2 symbols in set theory; "n" and "u" n = AND u = OR

  16. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ohh I see, makes sense.

  17. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    "and" defines the intersection (commonality) of sets

  18. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    im thinking F might be off

  19. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so #1 from what I see is A #2 is D

  20. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    |dw:1366392293192:dw| notO or Rh is: (100-7)/100 i had a repetition in there

  21. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok now Im a bit confused.

  22. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    notO includes the areas: 47, 8 Rh includes the areas: 47, 38 if we add these together to find the probability of notO or Rh, im doubling an area.

  23. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh

  24. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    4. that his blood type was Type O and notRh? this one might be off as well |dw:1366392674723:dw| the commonality of O "and" notRH is spose to be 7/100

  25. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    other than that, i think its sound :)

  26. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so was I right about #1 and #2

  27. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    yes, it might help to rewrite the options in 100 format A. 15/100 B. 85/100 C . 93/100 D. 55/100 E. 7/100 F. 38/100 that should be more intuitive

  28. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay Thanks

  29. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    good luck :)

  30. CarlosGP
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @aussy123, @amistre64 has been quicker than me. I was preparing these tables for you. In the first table you have the given data in green and the calculated data in yellow. The other sisx tables correspond to each question of the problem where I have shaded in green the data to consider. Though late, I hope it helps

    1 Attachment
  31. aussy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh Cool thats very helpful! Thanks to the both of you!!

  32. amistre64
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    nice tables, im not sure if i could process those in that manner ...

  33. CarlosGP
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @amistre64, thanks. They are known as contingency tables in Statistics

  34. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.