osanseviero
  • osanseviero
In a school there are 300 matriculated students (some probability problems)
Mathematics
chestercat
  • chestercat
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osanseviero
  • osanseviero
210 of those 300 enter the class. 80% of the students that enter the class get good grades, 15% of the students that dont enter the class get good grades
osanseviero
  • osanseviero
If we chose a random matriculated student, which is the probability of him: 1. Being in the class 2. Don't being in the class and getting good grades 3. Getting good grades
osanseviero
  • osanseviero
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osanseviero
  • osanseviero
a. So 210/300=7/10
anonymous
  • anonymous
id say so too
osanseviero
  • osanseviero
How to do the second?
anonymous
  • anonymous
first you find how many students that arnt in the class and are getting gud grades so 90 x 15/100 = 27/2 feel sorry for the student that lost a limb :(
anonymous
  • anonymous
cause apparently in that class there is half of a student :'(
osanseviero
  • osanseviero
wait a sec, please
osanseviero
  • osanseviero
lol
anonymous
  • anonymous
haha xD well there 90 students not in the class, and only 15% of the 90 pass, so 90 x 15/100
osanseviero
  • osanseviero
90 persons is the 30% of total
osanseviero
  • osanseviero
are you sure?
anonymous
  • anonymous
and then 27/2 / 300 = 9/200
anonymous
  • anonymous
umm, i thought i was xD
osanseviero
  • osanseviero
27/2 is the number of persons that got a good grade
anonymous
  • anonymous
and didnt come to class but now idk
anonymous
  • anonymous
normally when i got half a person it was a sign that something went wrong but my reasoning makes sense atleast to me lol
osanseviero
  • osanseviero
Can you repeat your reasoning again? (sorry)
anonymous
  • anonymous
90 students are people that do not come to class, 15% of these students are students that do well in exams. therefore 90 x 15/100 = 27/2
osanseviero
  • osanseviero
Ok, I see now :D
osanseviero
  • osanseviero
And for the third question?
osanseviero
  • osanseviero
We know that 9 people that did not entered got good grades. We need to see the ones that did come in
osanseviero
  • osanseviero
So 80% of 210
anonymous
  • anonymous
it would be 210 x 80/100 + 27/2
osanseviero
  • osanseviero
168 entered and passed, 9 entered and passed, so 176
anonymous
  • anonymous
y 9?
osanseviero
  • osanseviero
the 9 did not enter and did pass*
osanseviero
  • osanseviero
Sooo...176...and 44/75 (check please)
osanseviero
  • osanseviero
Probability of entering and getting a good grade
anonymous
  • anonymous
but it should be 168 + 27/2 because the number of students that didnt come to class and are getting gud grades are 27/2
anonymous
  • anonymous
so 195/2 students pass and the probability of the teacher choosing one is 195/2 /300
osanseviero
  • osanseviero
Sorry, internet crashed
osanseviero
  • osanseviero
So 181.5/300
osanseviero
  • osanseviero
Weird numbers :/
osanseviero
  • osanseviero
Last one is: Chance of selecting a student that have passed and entered the class
osanseviero
  • osanseviero
7/10 * 8/10 = 56/100 = 38/50= 19/25
osanseviero
  • osanseviero
So,...yes?

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