Probability (unsure where to start)

[DanielEd]

Hi all
I was wondering if someone could help me, this is the question i was given

• the pass mark is 40;
• Calculate the probability that a male student and a female student chosen at random from this data set have both passed Maths.
• Calculate the probability that a student chosen at random from this dataset passed english.

If it is known that 70% of the ‘overseas’ students passed english, calculate the probability that a student chosen at random who has passed english is not from ‘overseas’.

Ive managed to work out the first two parts of the question and was looking for help on where to start on the third part. the only information i have is that 45 people passed and 3 failed.

I havent included the set of data as there were 48 different pieces of data and it felt unnecessary.
Any help would be appreciated

 

[Deleted member 4993]

Hi all
I was wondering if someone could help me, this is the question i was given

• the pass mark is 40;
• Calculate the probability that a male student and a female student chosen at random from this data set have both passed Maths.
• Calculate the probability that a student chosen at random from this dataset passed english.

If it is known that 70% of the ‘overseas’ students passed english, calculate the probability that a student chosen at random who has passed english is not from ‘overseas’.

Ive managed to work out the first two parts of the question and was looking for help on where to start on the third part. the only information i have is that 45 people passed and 3 failed.

I havent included the set of data as there were 48 different pieces of data and it felt unnecessary.
Any help would be appreciated

Please provide us with the "exact" question including all the data supplied.

Please also refer to our submission guideline at: https://www.freemathhelp.com/forum/...ines-from-the-sites-owner.109846/#post-455414

 

[pka]

I haven't included the set of data as there were 48 different pieces of data and it felt unnecessary.

Without a complete data set how do you have an expectation of any help?

 

[Dr.Peterson]

Hi all
I was wondering if someone could help me, this is the question i was given

• the pass mark is 40;
• Calculate the probability that a male student and a female student chosen at random from this data set have both passed Maths.
• Calculate the probability that a student chosen at random from this dataset passed english.

If it is known that 70% of the ‘overseas’ students passed english, calculate the probability that a student chosen at random who has passed english is not from ‘overseas’.

Ive managed to work out the first two parts of the question and was looking for help on where to start on the third part. the only information i have is that 45 people passed and 3 failed.

I havent included the set of data as there were 48 different pieces of data and it felt unnecessary.
Any help would be appreciated

The fact that you bulleted a given fact and the first two questions, and didn't bullet the third question, got me a little confused! So you're asking about the bold line, right? It would have been appropriate to tell us your answers to the first two, so we'd have a place to start.

You've found P(passed English), and you are told P(passed English | overseas). You want to find P(not overseas | passed English). We don't need any more data, but we do need to know what you have learned that might be applicable. Do you know any theorems relating to the sorts of probabilities I just listed?