# Which one of these has the highest standard deviation and why? Watch

1. Mean +/- Standard Deviation.

1) 24 +/- 12
2) 57 +/- 17
3) 150 +/- 68
4) 22 +/- 15

is it 3?

if so, then using the formula SD/ Mean * 100.

why does option 4 give you the highest %.

15/22 *100 gives you 68%
2. (Original post by CyberKid)
Mean +/- Standard Deviation.

1) 24 +/- 12
2) 57 +/- 17
3) 150 +/- 68
4) 22 +/- 15

is it 3?

if so, then using the formula SD/ Mean * 100.

why does option 4 give you the highest %.

15/22 *100 gives you 68%
Since standard deviation is a value in its own right I think the answer is number 3; although you need to consider the spread around the given mean if you're using the values in a test. Number 4 seems more variable.

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: November 29, 2010
Today on TSR

### Oxford interview invitations

When can you expect yours?

### Official Cambridge interview invite list

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• 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.