You are Here: Home >< A-levels

# Probability S1 question?

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. If someone could help me with this question and explain to me how you got it it would be a great help

At a certain location renowned for road accidents there is a 0.6 chance of there being an accident on a wet day and a 0.2 chance of there being an accident on a dry day. Long term records show that there is a 30% chance of the location having a day which is classified as wet. By first drawing a tree diagram, determine: a) the probability that there will be an accident at the location next Monday.
b) the probability that next Monday is a wet day if there is an accident at the location that day.

Many thanks!
2. First off, do you know how to draw a tree diagram?
3. (Original post by JSG29)
First off, do you know how to draw a tree diagram?
Yes i do
4. (Original post by tinawu)
Yes i do
Draw your tree diagram to show all possibilities of events.

There are two events, one that there will be an accident and the other being the weather on the day.

You can then calculate the probabilities of each outcome using the basics.

## 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
1. Oops, you need to agree to our Ts&Cs to register

Updated: September 23, 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

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll

## 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.

### 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.

### Study tips from A* students

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