## Statistics 1 – Binomial Distribution

This topic is related to Core 2 binomial expansion in that both the topics use the nCr button on the calculator to generate the rows of Pascal’s triangle. Apart from that they  shouldn’t be confused.

You will need to be able to use the formula (in the formula book) and use the tables. Below are a couple of questions and three videos to help you.

June 2012 Question 6a – answer here

June 2011 Question 6 – answer here

Using the formula

Using the tables

p<0.5

p>0.5

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## Why wait for me…?

In this blog are a lot of links to revision pages written by other people. That way you can revise any topic you like without waiting for me to write the next blog. I’m going to take a break tomorrow so the next blog will by Monday morning.

AQA Website

All the past papers are available on the AQA website. Just select

mathematics, A level, mathematics (6360), all available series

You can then find any paper from any year with the markschemes.

Exam Solutions Website

This is a great website that has revision videos for almost every topic. Links to the AS pages are below

Core 1

Core 2

Statistics 1

MathedUp

This website has videos and practice questions for most topics of AS Maths. A good place to start is on his A level takeaway page.

FMSP Revision Videos

This page just has videos for Further Maths. Included in this is some Statistics 1 videos towards the bottom of the page.

Good YouTube channels

You can search these channels for any topics you are stuck on.

Jack Brown

Hegarty Maths

## Statistics 1 – probability from tables

Yesterday you looked at how to solve probability questions using tree diagrams. Today we’ll look at the next method from tables.

January 2011 Question 2 – answer here

June 2010 Question 5 – answer here

As always look at the videos or ask at our Facebook group if you need more help.

This video explains how to make a table

This explains the simplest questions

This next one looks at conditional probabilities

## Statistics 1 – tree diagrams

Most, if not all probability questions can be answered either by tree diagrams or a table. This first post looks at tree diagrams. Tomorrow we will look at tables. Take a look at the questions below. If you need help then look at the video or if you are a New College student you can get more help at our Facebook Support Group.

January 2007 Question 5 – answer here

June 2010 Question 5a – answer here

A simpler example video

A more complex example

## Statistics 1 – further mean and standard deviation

Yesterday you should have revised how to find the mean and standard deviation using your calculator. But what would happen to the mean and standard deviation if the data changed. This is what we will look at today. Sadly I can’t find a video so instead I’ll write a brief explanation. Once your happy you understand then take a look at the questions and as normal New College students can get further help at our Facebook Support Group.

For a group of students the mean height is 140 cm with a standard deviation of 20 cm. Supposing the students were incorrectly measured, what would the new mean and standard deviation be if;

1. all the heights were over measured by 1 cm.

In this case only the mean will increase by 1cm to 141 cm. The standard deviation won’t change as the data is not more spread out, just moved up by one.

Similarly the median and quartiles would increase by 1 cm and the range would be unchanged.

2. all the heights should actually be 10% higher.

In this case both the mean and standard deviation should be increased by 10%. This is because adding 10 % to the shortest student won’t increase the height by as much as adding 10% to the tallest student. As a result the data becomes more spread out.

Similarly the quartiles and range will also increase by 10%.

Now have a go at the questions below. You may also need to check the videos below if you’ve forgotten how to find the median and quartiles.

June 2010 Question 2 – answer here

June 2013 Question 1a – answer here

## Statistics 1 – Calculator Check

Today take a look at one of these two videos and make sure you know how to use your calculator to find the mean and standard deviation. Once you are happy you can find them correctly, have a go at the exam questions below.

January 2010 q.2 – answer here

January 2009 q.1 – answer here

For these question you will need to find quartiles. If you’ve forgotten this then take a look at video at the bottom of the page.

If you are a New College student and need more help then post a question on our Facebook Group.

This video below shows  you how to find median and quartiles.