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In a school there are 300 matriculated students (some probability problems)
 5 months ago
 5 months ago
In a school there are 300 matriculated students (some probability problems)
 5 months ago
 5 months ago

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osansevieroBest ResponseYou've already chosen the best response.0
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
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
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
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
dw:1383272509491:dw
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
a. So 210/300=7/10
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
How to do the second?
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
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 :(
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
cause apparently in that class there is half of a student :'(
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
wait a sec, please
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
haha xD well there 90 students not in the class, and only 15% of the 90 pass, so 90 x 15/100
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
90 persons is the 30% of total
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
and then 27/2 / 300 = 9/200
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
umm, i thought i was xD
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
27/2 is the number of persons that got a good grade
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
and didnt come to class but now idk
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
normally when i got half a person it was a sign that something went wrong but my reasoning makes sense atleast to me lol
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
Can you repeat your reasoning again? (sorry)
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
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
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
And for the third question?
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
We know that 9 people that did not entered got good grades. We need to see the ones that did come in
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
it would be 210 x 80/100 + 27/2
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
168 entered and passed, 9 entered and passed, so 176
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
the 9 did not enter and did pass*
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
Sooo...176...and 44/75 (check please)
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
Probability of entering and getting a good grade
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
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
 5 months ago

HawkCrimsonBest ResponseYou've already chosen the best response.1
so 195/2 students pass and the probability of the teacher choosing one is 195/2 /300
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
Sorry, internet crashed
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
Last one is: Chance of selecting a student that have passed and entered the class
 5 months ago

osansevieroBest ResponseYou've already chosen the best response.0
7/10 * 8/10 = 56/100 = 38/50= 19/25
 5 months ago
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