Question

Help :) Last one i believe.
One-hundred students were allowed to re-take an exam for their math course. The probability distribution shows how studying for the latest

exam affected their grade when compared with the first time they took the exam. What is the probability that a student who studied for the

exam saw an increase in their exam grade? Round to the nearest thousandth.

Exam Grades Studied Did Not Study Totals
Raise in Grades 0.52 0.06 0.58
No Raise in Grades 0.05 0.37 0.42
Totals 0.57 0.43 1

Answer 1

Would be a lot easier to read it if you posted a screenshot or formatted the table correctly.

Looks like you just want to look at the column of "studied for exam" ignore the rest.

0.52 is the prob someone studied for the exam and raised their grade

0.57 is the total prob of students who studied for the exam

From those two, find the probability.

Answer 2

57% of students studied, which decomposes into
52% who both studied and saw an increase in their exam grade
5% who both studied and did Not see an increase in their exam grade

The percentages above are relative to the whole population of 100 students, to get the requested probability, recall that:

One way to find out the probability of an event is to
Take the ratio of the number of times the event happened, over the total number of times the event could have happened.


Total number of times the event happened:
52 = 52% of 100 students studied and saw an increase in their exam grade
Total number of times the event could have happened:
57 = 57% of 100 students studied

Answer 3

Nice copy and paste job, @LuhVee1

Answer 4

https://www.wyzant.com/resources/answers/131641/probability_question_help

Answer 5

^looks familiar huh, @LuhVee1?

Answer 6

Sorry for the late reply I was at my interview D=
@agent0smith and is the image.

Answer 7

Wrong image?

Answer 8

Sorry for the confusion DX

Answer 9

See my first post, it's all there

Answer 10

The is probability 5?

Answer 11

What...? Go back to my first post. I gave the two numbers to divide.

Answer 12

Okay

Answer 13

0.5? if not I don't understand it.
Do I multiply?

Answer 14

"What...? Go back to my first post. I gave the two numbers to divide."



"0.52 is the prob someone studied for the exam and raised their grade

0.57 is the total prob of students who studied for the exam

From those two, find the probability."

Answer 15

0.912. Thanks didn't realize you said divide some for giving you a hard time.
Thanks you making me understand you where most helpful <3

Answer 16

No problem.