## Cumulative Frequency Graphs

Want to download the Cumulative Frequency Graph revision notes in PDF format? Cumulative frequency is adding up frequencies to provide the running total. It helps us find the median, lower quartile range and upper quartile range in a set of data.Example:Look at the table. Compute the cumulative frequencies by adding them up to have a …

## Standard Deviation Formulas

Want to download the Standard Deviation revision notes in PDF format? [mathjax] What is Standard Deviation? As we know, random variables have few common numerical characteristic – average value, variation and standard deviation. Now we consider standard deviation of the random variable X. Formulas for calculation variation are next: 1. Population variation for random variable, …

## Sampling (Statistics)

Want to download the Sampling revision notes in PDF format? [mathjax] What Is Sampling In Maths? Several boxes of apples are undergoing a quality check. What will be the easiest way to do it? Checking all the apples piece by piece will be time-consuming. Taking a few apples from each box to examine is the …

## Representing Data

Want to download the Representing Data revision notes in PDF format? [mathjax] What Is Representing Data? This is the process of selecting samples through different sampling techniques. Then, gather the necessary information. The next step is to organise and present information in a way that can easily analysed and interpreted.  There are many ways to …

## Histograms

Want to download the Histograms revision notes in PDF format? What are Histograms? A histogram is a graph that is made up of vertical lines of equal bases centred at the class midpoints. It is similar to bar charts. However, in bar charts, all bars are the same width in the bar and the height …

## Probability

Want to download the Probability revision notes in PDF format? Introduction Probability is the likelihood or chance of an event occurring. Probability = the number of ways of achieving success the total number of possible outcomes For example, the probability of flipping a coin and it being heads is ½, because there is 1 way …