Have I entered a correct answer?

[Nemanjavuk69]

Dear everyone

I am doing an exercise to become better at statistics and probability, more specifically, I am doing the below exercise, however, whenever I submit it says the answers are wrong. I have double and triple checked and I am afraid if I have done something wrong OR if it is the website that just has been badly programmed.

(Ps. for the last question about independence it was a yes or no question, and I chose no which is correct)

I have attached an image to show my answer as well as the question

 

[Dr.Peterson]

Dear everyone

I am doing an exercise to become better at statistics and probability, more specifically, I am doing the below exercise, however, whenever I submit it says the answers are wrong. I have double and triple checked and I am afraid if I have done something wrong OR if it is the website that just has been badly programmed.

(Ps. for the last question about independence it was a yes or no question, and I chose no which is correct)

I have attached an image to show my answer as well as the question


View attachment 38360

I don't see anything that says what form they want the answers in. Did they ask for 3 decimal places? If so, then you rounded one incorrectly.

Or they might have asked for fractions, which would eliminate the precision issue, but your answers would all be "wrong".

In any case, it would be good if they at least said that the answers are close, or that only one is wrong.

 

[Nemanjavuk69]

I don't see anything that says what form they want the answers in. Did they ask for 3 decimal places? If so, then you rounded one incorrectly.

Or they might have asked for fractions, which would eliminate the precision issue, but your answers would all be "wrong".

In any case, it would be good if they at least said that the answers are close, or that only one is wrong.

Dear Peterson

I have solved a lot of their previous excercises, for all the other excercises the answer can be EITHER (very important to know that the answer can be EITHER) a fraction or decimal numbers. If you use decimal numbers and the answer is, let's say 3/11 then 0.272 and 0.273 are both accepted (I think they did this on purpose), however, as long as my error is a simple "rounding up or down" error and not me getting completely wrong answers due to using formulas wrongly, than I can happily accept that.

I am glad for your answer and may you have a wonderful day/ night forward Dr. Peterson!

 

[Dr.Peterson]

It sounds like the system you are using is one of the better ones; I've seen a variety.

So we can't be sure why they rejected your answer, and if I were working with you in person, I might do some experimenting to figure it out; but we are troubleshooting your own thinking, not the software, so none of that is necessary, as you say.

 

[Steven G]

The first two and the fourth one are all wrong. You have the answers reversed!

 

[Dr.Peterson]

The first two and the fourth one are all wrong. You have the answers reversed!

What part of the problem am I misreading?

There are 180 in all; 80 have Playstation (A), 90 have Xbox (B), 30 have both (A and B).

P(A) = 80/180; P(B) = 90/180; P(A and B) = 30/180; P(B | A) = 30/80.

 

[Nemanjavuk69]

The first two and the fourth one are all wrong. You have the answers reversed!

I am also curious. I have double checked, triple checked (even gave under to ChatGPT) I still get the same answers (both decimal and fractions). May I ask what your answers are?

 

[Nemanjavuk69]

What part of the problem am I misreading?

There are 180 in all; 80 have Playstation (A), 90 have Xbox (B), 30 have both (A and B).

P(A) = 80/180; P(B) = 90/180; P(A and B) = 30/180; P(B | A) = 30/80.

I do the same as you. I also tried to round up and down and it still rejects my answer. I think it simply just this one excercise that has a “bug” (malfunction in the code) which makes it unable to render the answers correctly.

 

[Steven G]

Ooops, I got A and B reversed. Sorry about that.