anonymous
  • anonymous
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katieb
  • katieb
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anonymous
  • anonymous
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
amistre64
  • amistre64
a venn might be usefull
anonymous
  • anonymous
whats that

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amistre64
  • amistre64
its a diagraham that defines sets with circles
anonymous
  • anonymous
Oh where can I find it
amistre64
  • amistre64
|dw:1366391420781:dw|
anonymous
  • anonymous
Oh
amistre64
  • amistre64
|dw:1366391462898:dw|
amistre64
  • amistre64
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
anonymous
  • anonymous
ok..Im following
amistre64
  • amistre64
|dw:1366391683621:dw|
amistre64
  • amistre64
this helps us define the numbers involved and the combinations that they ask for
amistre64
  • amistre64
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
anonymous
  • anonymous
One question just so I know Im reading the diagram right. Is Rh. n. O , Rh.NOT.O?
amistre64
  • amistre64
there are 2 symbols in set theory; "n" and "u" n = AND u = OR
anonymous
  • anonymous
ohh I see, makes sense.
amistre64
  • amistre64
"and" defines the intersection (commonality) of sets
amistre64
  • amistre64
im thinking F might be off
anonymous
  • anonymous
so #1 from what I see is A #2 is D
amistre64
  • amistre64
|dw:1366392293192:dw| notO or Rh is: (100-7)/100 i had a repetition in there
anonymous
  • anonymous
Ok now Im a bit confused.
amistre64
  • amistre64
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.
anonymous
  • anonymous
oh
amistre64
  • amistre64
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
amistre64
  • amistre64
other than that, i think its sound :)
anonymous
  • anonymous
so was I right about #1 and #2
amistre64
  • amistre64
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
anonymous
  • anonymous
okay Thanks
amistre64
  • amistre64
good luck :)
anonymous
  • anonymous
@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
anonymous
  • anonymous
Oh Cool thats very helpful! Thanks to the both of you!!
amistre64
  • amistre64
nice tables, im not sure if i could process those in that manner ...
anonymous
  • anonymous
@amistre64, thanks. They are known as contingency tables in Statistics

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