Here is the list of Squidoo lenses by Lensmaster **catman3000**,

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1. **What is the Binomial Probability Formula? Easy explanation with questions.**The formula for binomial probability is:
nCr x p^r x q^(n-r)
Where p is probability of the event happening and q is the probability of the event not happening.
nCx can be calculated using n!/[(n-r)!r!] or using the button for combinations on your scientific calculator.
This formula is useful w...

Education - Fri, 12 Sep 2014 03:08:59

2. **Stratified Samples (Stats Help). What is a Stratified Sample**In this article we shall be working out the amount of people you need to select from each category in your sample (stratified sampling). If you are carrying out a stratified sample the amount chosen from each category is proportional to the size of the category in the population.
To calculate th...

How-To & Education - Wed, 03 Apr 2013 15:24:06

3. **5 Essential Items For Your Math Exam (math equipment).**Taking any exam can be tricky, but taking a math exam is one of the most daunting exams for the majority of students. To make things go smoother during you math exam make sure you have all the correct equipment. You don't want to waste valuable time asking the moderators or teachers for equipment...

How-To & Education - Wed, 20 Feb 2013 17:17:16

4. **How to factorise x^2 - 16 (the difference between two squares formula)**In order to factorise x^2 -16 you need to understand the rule for the difference between two squares. So if you have an expression in the form a^2 - b^2 then this can be factorised to (a b)(a-b). This result is called the difference between two squares (because you have a^2 and b^2 which are squa...

How-To & Education - Wed, 20 Feb 2013 17:16:37

5. **Nth term of linear sequences that go up and down (easy method)**The nth term is the name give to the formula of a number sequence. It tells you how you get from the position numbers (that is the 1s't number , 2nd number, 3rd number...) to the values in the sequence. Once you have the nth term other numbers in the sequence can be worked out using your formula ...

How-To & Education - Wed, 20 Feb 2013 17:16:07

6. **What is 45 shared in the ratio 3:2? (dividing money by a ratio problem)**Here you will learn how to share an amount by a ratio. Make sure the amount given is the total amount otherwise these steps will not work.
Step A: Add up the parts in the ratio.
Step B Divide the amount by the total amount of parts (answer from step A). This will give you the value of each part...

How-To & Education - Wed, 20 Feb 2013 17:15:52

7. **How to make x the subject of any formula eg make x the subject of y = 3x 8**If you are asked to make x the subject of a formula, then you need rearrange the formula so that you have a formula for x.
In order to make x the subject you need to isolate the value of x by moving all the other terms to the other side of the formula.
For example, make x the subject of this fo...

How-To & Education - Wed, 20 Feb 2013 17:15:38

8. **What Is The Difference Between Combinations and Permutations?**With permutations the order you arrange the items matters and with combinations the order you arrange the items doesn't matter. There will always be more permutations than combinations. It's always best to work out the number of permutations first then work out the number of combinations by divid...

How-To & Education - Wed, 20 Feb 2013 17:15:24

9. **What Are Lower And Upper Bounds And How Can You Work Them Out?**The lower bound is the smallest possible value of a number and the upper bound is the largest possible value of a number.
In order to find the lower and upper bound of a number first write down the values below and above the number on the scale. So say if you have 40m rounded to the nearest 10m,...

How-To & Education - Wed, 20 Feb 2013 17:15:11

10. **Working out the Expectation from a Discrete Probability Distribution (or mean)**To work out the expectation (the mean) from a discrete probability distribution first multiply the x values by their corresponding probability then total all these numbers up.
E(X) is usually used to refer to the expectation so this can be summarised with the following formula:
E(X) = Sum of [x...

How-To & Education - Wed, 20 Feb 2013 17:14:17

11. **The Formulas for the Area and Perimeter of a Semicircle.**Working out the area of a semicircle can be done using the following formula:
(Pi x r)/2
That is you work out the area of the full circle and half the answer.
Working out the perimeter of a semicircle is a little harder as you need to remember to add the diameter back onto your final answer:
(P...

How-To & Education - Wed, 20 Feb 2013 17:14:01

12. **Surveyhead Survey Site Review - Another Good Cash Survey Site!**Surveyhead is an online cash suvey site, where you get paid to express your opinions on a range of subjects or new products. If you are new to online surveys then online surveys can be a fun way to earn some extra cash in your spare time. All you need is an internet connection to start making mon...

business-and-work - Tue, 15 Jan 2013 12:07:27

13. **Percentage Decrease Problems. 2 Easy Ways To Decrease An amount By A Percentage.**If you are asked to decrease an amount by a given percentage then you are making the amount smaller. Below are two methods that you can apply to a percentage decrease question.
Method 1
1. Begin by dividing the amount by 100 to give 1%.
2. Multiply this 1% amount by your percentage.
3. Subtract t...

How-To & Education - Tue, 15 Jan 2013 12:07:18

14. **You Gov Survey Site Review. Yougov is a steady little earner.**You Gov is a worldwide survey panel, where you can express your views by taking online surveys, and get paid for doing so. Taking online surveys are a great way to earn some extra cash in your spare time. Completing surveys only take around 10 minutes of your time and can be done easily at home o...

business-and-work - Tue, 15 Jan 2013 12:07:07

Updated: Fri, 21 Oct 2016 14:05:09 GMT -

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