You are Here: Home >< Maths

# Statistics help please :) Watch

1. I'm stuck on a past paper question for S2:

A garden centre sells canes of nominal lenght 150cm, the canes are cought from a supplier who uses a machine to cut canes of length L where L ~ N(mu, 0.3^2)

a. find the value of mu, to the nearest .1 cm, such that there is only a 5% chance that a cane supplied to the garden centre will have length less than 150 cm.

I got the answer as 149.8

Where I'm stuck is b and c:

b. find the probability that at most 2 of the canes have length less than 150cm.
Do I stick with the normal distribution, or do I have to change to the binomial?

c. USing a suitable approximation, find the probability that fewer than 35 of the canes will have length less than 150cm.

Do I use binomial?

Thanks!

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 28, 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

### 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

## Groups associated with this forum:

View associated groups
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.