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 one year ago
In a school there are 300 matriculated students (some probability problems)
 one year ago
In a school there are 300 matriculated students (some probability problems)

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osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0210 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
 one year ago
Best ResponseYou've already chosen the best response.0If 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
 one year ago
Best ResponseYou've already chosen the best response.0dw:1383272509491:dw

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0a. So 210/300=7/10

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0How to do the second?

HawkCrimson
 one year ago
Best ResponseYou've already chosen the best response.1first 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 :(

HawkCrimson
 one year ago
Best ResponseYou've already chosen the best response.1cause apparently in that class there is half of a student :'(

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0wait a sec, please

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

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.090 persons is the 30% of total

HawkCrimson
 one year ago
Best ResponseYou've already chosen the best response.1and then 27/2 / 300 = 9/200

HawkCrimson
 one year ago
Best ResponseYou've already chosen the best response.1umm, i thought i was xD

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.027/2 is the number of persons that got a good grade

HawkCrimson
 one year ago
Best ResponseYou've already chosen the best response.1and didnt come to class but now idk

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

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Can you repeat your reasoning again? (sorry)

HawkCrimson
 one year ago
Best ResponseYou've already chosen the best response.190 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
 one year ago
Best ResponseYou've already chosen the best response.0And for the third question?

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

HawkCrimson
 one year ago
Best ResponseYou've already chosen the best response.1it would be 210 x 80/100 + 27/2

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0168 entered and passed, 9 entered and passed, so 176

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0the 9 did not enter and did pass*

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Sooo...176...and 44/75 (check please)

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Probability of entering and getting a good grade

HawkCrimson
 one year ago
Best ResponseYou've already chosen the best response.1but it should be 168 + 27/2 because the number of students that didnt come to class and are getting gud grades are 27/2

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

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Sorry, internet crashed

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

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.07/10 * 8/10 = 56/100 = 38/50= 19/25
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