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aussy123 Group Title

Matching probability question help! Medal Rewarded!!

  • one year ago
  • one year ago

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  1. aussy123 Group Title
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    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

    • one year ago
  2. amistre64 Group Title
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    a venn might be usefull

    • one year ago
  3. aussy123 Group Title
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    whats that

    • one year ago
  4. amistre64 Group Title
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    its a diagraham that defines sets with circles

    • one year ago
  5. aussy123 Group Title
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    Oh where can I find it

    • one year ago
  6. amistre64 Group Title
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    |dw:1366391420781:dw|

    • one year ago
  7. aussy123 Group Title
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    Oh

    • one year ago
  8. amistre64 Group Title
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    |dw:1366391462898:dw|

    • one year ago
  9. amistre64 Group Title
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    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

    • one year ago
  10. aussy123 Group Title
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    ok..Im following

    • one year ago
  11. amistre64 Group Title
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    |dw:1366391683621:dw|

    • one year ago
  12. amistre64 Group Title
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    this helps us define the numbers involved and the combinations that they ask for

    • one year ago
  13. amistre64 Group Title
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    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

    • one year ago
  14. aussy123 Group Title
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    One question just so I know Im reading the diagram right. Is Rh. n. O , Rh.NOT.O?

    • one year ago
  15. amistre64 Group Title
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    there are 2 symbols in set theory; "n" and "u" n = AND u = OR

    • one year ago
  16. aussy123 Group Title
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    ohh I see, makes sense.

    • one year ago
  17. amistre64 Group Title
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    "and" defines the intersection (commonality) of sets

    • one year ago
  18. amistre64 Group Title
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    im thinking F might be off

    • one year ago
  19. aussy123 Group Title
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    so #1 from what I see is A #2 is D

    • one year ago
  20. amistre64 Group Title
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    |dw:1366392293192:dw| notO or Rh is: (100-7)/100 i had a repetition in there

    • one year ago
  21. aussy123 Group Title
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    Ok now Im a bit confused.

    • one year ago
  22. amistre64 Group Title
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    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.

    • one year ago
  23. aussy123 Group Title
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    oh

    • one year ago
  24. amistre64 Group Title
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    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

    • one year ago
  25. amistre64 Group Title
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    other than that, i think its sound :)

    • one year ago
  26. aussy123 Group Title
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    so was I right about #1 and #2

    • one year ago
  27. amistre64 Group Title
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    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

    • one year ago
  28. aussy123 Group Title
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    okay Thanks

    • one year ago
  29. amistre64 Group Title
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    good luck :)

    • one year ago
  30. CarlosGP Group Title
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    @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

    • one year ago
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  31. aussy123 Group Title
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    Oh Cool thats very helpful! Thanks to the both of you!!

    • one year ago
  32. amistre64 Group Title
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    nice tables, im not sure if i could process those in that manner ...

    • one year ago
  33. CarlosGP Group Title
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    @amistre64, thanks. They are known as contingency tables in Statistics

    • one year ago
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