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# What is cumulative frequency?

By Alex Blanc on the 11th of June, 2012

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Hi Mr.MI just found out that my comment was not ctoelpme. There must have been something wrong with the connection Justin Bieber has x' fans. Rebecca Black has 19 less than twice of Justin Bieber's fans. Together they have 21 fans in the class. How many fans do they each have?

By Alex Blanc on the 11th of June, 2012

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## Math dictionary

Cumulative Frequency -> C

## Definition :

Cumulative frequency of a particular value in a table can be defined as the sum of all the frequencies up to that value ( including the value itself ).

## Example :

By vicky on the 18th of January, 2013

## Simplify expressions with surds into the form a + b3

Be warned this topic is Chuck Norris hard. Make sure you've done the related topics below before you try and get your head round this one...

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So if you put a square root sign around a number that is not a square number, then what you have written is a surd.

e.g. √10 is a surd, because 10 is not a square number. √9 is not a surd, because 9 is a square number, so you can write √9= 3

Even if the number under the square root sign is not a square number, it can still be simplified.

Write the starting number as a product of two new numbers, where one of them is a square number (e.g. 45 -> 9 x 5).  Take the root of the square number, and write it outside of the root sign

e.g. √45 = √(9×5)=3√5

## Follow the links below to see how this topic has appeared in past exam papers

AQA Unit 2 March 2011 (H) - Page 11, Question 17

Other Relates Topics…

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