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|dw:1383272509491:dw|

a. So 210/300=7/10

id say so too

How to do the second?

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

Can you repeat your reasoning again? (sorry)

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

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?