Turn on thread page Beta
 You are Here: Home >< Maths

# Normal distribution watch

1. Could somebody possibly check over this for me? I thought my method was correct but it's the first question on a past paper and they normally give 'nicer' values for the answer (not sure how to phrase that sorry!) which specifically appear in the tables so now I'm doubting it.

Question:
Y is normally distributed with mean and standard deviation 2.50. Given that find the value of .

I've done:

From the normal tables,

Rearrange to get to 3sf.

Thank you!
2. (Original post by olivia30)
x
looks good to me are you edexcel for maths?
3. (Original post by olivia30)
...
What normal tables are you using? I haven't seen ones in the formula booklet with that much accuracy, are you on OCR or something?
4. (Original post by Zacken)
What normal tables are you using? I haven't seen ones in the formula booklet with that much accuracy, are you on OCR or something?
(Original post by DylanJ42)
looks good to me are you edexcel for maths?
Thanks both of you! I'm OCR. My tables gave me p(0.524)=0.6999 so I used linear interpolation (is that what it's called) to get the .33 on the end. Not really necessary since they only ask for answers to 3sf but oh well
5. (Original post by olivia30)
Thanks both of you! I'm OCR. My tables gave me p(0.524)=0.6999 so I used linear interpolation (is that what it's called) to get the .33 on the end. Not really necessary since they only ask for answers to 3sf but oh well
its no problem

ah i see, well if youre taught to use interpolation for these scenarios then you're definitely right
6. (Original post by Zacken)
What normal tables are you using?
In case you're really interested (which I'm sure you're not ):
7. (Original post by olivia30)
In case you're really interested (which I'm sure you're not ):
...I'm worse than you think. I went and googled it myself half an hour ago, it's the same formula booklet I use for STEP!
8. (Original post by Zacken)
...I'm worse than you think. I went and googled it myself half an hour ago, it's the same formula booklet I use for STEP!
Don't worry, I googled the Edexcel one to see the difference! Yours is divided into specific C1, C2 etc sections! Jealous. assuming you're Edexcel, that is.

(Original post by DylanJ42)
its no problem

ah i see, well if youre taught to use interpolation for these scenarios then you're definitely right
Good to know, thank you!

Turn on thread page Beta

### Related university courses

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:
Updated: March 4, 2016
The home of Results and Clearing

### 2,688

people online now

### 1,567,000

students helped last year
Today on TSR

### A-level results day chat: 2 days to go!

Chat about results here

### University open days

1. SAE Institute
Animation, Audio, Film, Games, Music, Business, Web Further education
Thu, 16 Aug '18
2. Bournemouth University
Clearing Open Day Undergraduate
Fri, 17 Aug '18
3. University of Bolton
Fri, 17 Aug '18
Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups

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