Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
osanseviero
Group Title
In a school there are 300 matriculated students (some probability problems)
 10 months ago
 10 months ago
osanseviero Group Title
In a school there are 300 matriculated students (some probability problems)
 10 months ago
 10 months ago

This Question is Closed

osanseviero Group TitleBest 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
 10 months ago

osanseviero Group TitleBest 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
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
dw:1383272509491:dw
 10 months ago

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

HawkCrimson Group TitleBest ResponseYou've already chosen the best response.1
id say so too
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
How to do the second?
 10 months ago

HawkCrimson Group TitleBest 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 :(
 10 months ago

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

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
wait a sec, please
 10 months ago

HawkCrimson Group TitleBest 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
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
90 persons is the 30% of total
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
are you sure?
 10 months ago

HawkCrimson Group TitleBest ResponseYou've already chosen the best response.1
and then 27/2 / 300 = 9/200
 10 months ago

HawkCrimson Group TitleBest ResponseYou've already chosen the best response.1
umm, i thought i was xD
 10 months ago

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

HawkCrimson Group TitleBest ResponseYou've already chosen the best response.1
and didnt come to class but now idk
 10 months ago

HawkCrimson Group TitleBest 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
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
Can you repeat your reasoning again? (sorry)
 10 months ago

HawkCrimson Group TitleBest 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
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
Ok, I see now :D
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
And for the third question?
 10 months ago

osanseviero Group TitleBest 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
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
So 80% of 210
 10 months ago

HawkCrimson Group TitleBest ResponseYou've already chosen the best response.1
it would be 210 x 80/100 + 27/2
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
168 entered and passed, 9 entered and passed, so 176
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
the 9 did not enter and did pass*
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
Sooo...176...and 44/75 (check please)
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
Probability of entering and getting a good grade
 10 months ago

HawkCrimson Group TitleBest 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
 10 months ago

HawkCrimson Group TitleBest 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
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
Sorry, internet crashed
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
So 181.5/300
 10 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
Weird numbers :/
 10 months ago

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

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

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
So,...yes?
 10 months ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.