You are Here: Home

# November 2003 S1 Question

Announcements Posted on
Talking about ISA/EMPA specifics is against our guidelines - read more here 28-04-2016
1. How would you do part a)? The mark scheme has me stumped :/
Attached Files
2. Nov 2003 question.docx (235.9 KB, 215 views)
3. (Original post by Dirtyflanker)
How would you do part a)? The mark scheme has me stumped :/
Its a discrete uniform distribution, so use the formula,
4. (Original post by raheem94)
Its a discrete uniform distribution, so use the formula,
I did that but to get all the marks you have to derive it from the probability distribution
5. (Original post by Dirtyflanker)
I did that but to get all the marks you have to derive it from the probability distribution

Use for

Now input the values and find
6. Wow, thanks wouldn't have expected the need for that formula in an s1 exam though :s
7. help me please..... who knows how to do the probabiltity question q2..
q: a fairground game involves trying to hit a moving target with a gunshot. a round consists of up to 3 shots. ten points are scored if a player hits the target, but the round is over if the player misses. linda has a constant probability of 0.6 of hitting the target and shots are INDEPENDENT OF ONE ANOTHER. (WHAT DOES THIS MEAN, HOW CAN I SHOW IT ON A TREE DIAGRAM OR ISIT A VENN DIAGRAM??)

a) find the probability that linda scores 30 points in a round

The r.v X is the no. of points linda scores in a round.
b) find the probability distribution of X
c) find the mean n SD of X

A game consists of 2 rounds
d)find the probability that linda scores more points in round 2 than in round 1.
8. Don't have the answers in front of me, but I sort of remember doing it a while back:
a) P(HHH) = 0.6 x 0.6 x 0.6
b) x 0 10 20 30
P(x)0.4 0.6x0.4 0.6x0.6x0.4 0.6x0.6x0.6

See the tree diagram attached. By independent- it just means that the probability of the next event happening is not dependent on the previous probability ie- a hit is always 0.6 and a miss is always 0.4.

c) Just use the formulas
d) Always write out what the possibilities are, so if she needs more points in round 2 than in round 1 you can write it out as:

Round 2 Round 1
P(20) P(0)
P(30) P(0)
P(20) P(10)
P(30) P(10)
P(30) P(20)

## 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: May 17, 2012
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

### How to predict exam questions

No crystal ball required

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams