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

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

Mathematics
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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
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
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a. So 210/300=7/10
id say so too
How to do the second?
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 :(
cause apparently in that class there is half of a student :'(
wait a sec, please
lol
haha xD well there 90 students not in the class, and only 15% of the 90 pass, so 90 x 15/100
90 persons is the 30% of total
are you sure?
and then 27/2 / 300 = 9/200
umm, i thought i was xD
27/2 is the number of persons that got a good grade
and didnt come to class but now idk
normally when i got half a person it was a sign that something went wrong but my reasoning makes sense atleast to me lol
Can you repeat your reasoning again? (sorry)
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
Ok, I see now :D
And for the third question?
We know that 9 people that did not entered got good grades. We need to see the ones that did come in
So 80% of 210
it would be 210 x 80/100 + 27/2
168 entered and passed, 9 entered and passed, so 176
y 9?
the 9 did not enter and did pass*
Sooo...176...and 44/75 (check please)
Probability of entering and getting a good grade
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
so 195/2 students pass and the probability of the teacher choosing one is 195/2 /300
Sorry, internet crashed
So 181.5/300
Weird numbers :/
Last one is: Chance of selecting a student that have passed and entered the class
7/10 * 8/10 = 56/100 = 38/50= 19/25
So,...yes?

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