You are Here: Home >< A-levels

Statistics behind guessing in multiple choice question

Announcements Posted on
Would YOU be put off a uni with a high crime rate? First 50 to have their say get a £5 Amazon voucher! 27-10-2016
REMINDER: Do not post your personal statement on TSR, otherwise you may have to rewrite it from scratch. Click here for more info. 11-10-2016
1. I usually tend to run out of time (in my physics paper) as a result i keep the multiple choice questions to the end. Let's say I have 2 mins left and 10 multiple choice questions. Statistically what would be the best option for me to do? i.e chose all of the same option (all A) or randomly or what?
2. (Original post by ajaxkiller)
I usually tend to run out of time (in my physics paper) as a result i keep the multiple choice questions to the end. Let's say I have 2 mins left and 10 multiple choice questions. Statistically what would be the best option for me to do? i.e chose all of the same option (all A) or randomly or what?
I'm not really that good at maths but I think no matter what answer you choose for each individual question the chance that it will be right is still 1/4 so you might as well choose all a or random ones.
3. Either way you're gunna have a (1/4)^10 chance of getting them all right
4. The answers for multiple choice are totally random and computer generated by exam boards as it is a requirement of Ofqual. For yourself to get the most amount of marks in that 2 minutes just answer all the questions as there is no magic key to getting the most amount of marks. Exams have been purposefully designed that to avoid any form of bias for any specific option (a, b, c or d for example)
5. It's because, in the past by me guessing D for all options I usually got 4/10 and sometimes 5/10
but when i guess random i get 2/10 and sometimes 1
So i thought there was some kind of logic or mathematical relationship between guessing the same one and guessing different ones
6. Try to eliminate any definitely wrong options. Even if you only know one choice is wrong, it goes down to a 1 in 3 chance of getting the right answer.
7. You might as well tick all As, or all Bs, or any random combination, you have no way of knowing any given one is more likely than any other given one

Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 18, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

Halloween costume competition

Share your boo-tiful pics

How to cope with a heavy workload

Poll
Help with your A-levels

All the essentials

Student life: what to expect

What it's really like going to uni

Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Our tool will help you find the perfect course for you

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Resources by subject

Everything from mind maps to class notes.

Degrees without fees

Discover more about degree-level apprenticeships.

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

HEAR

Find out how a Higher Education Achievement Report can help you prove your achievements.

Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.