# Edexcel S1 Statistics

### Representing Data

Mean

Median and Quartiles

- Median, lower, upper quartiles and interquartile range for discrete data
- Cumulative frequency curves
- Interpreting class interval notation and common mistakes made
- Estimating the median from a grouped frequency table

Skewness

Standard deviation

Statistical diagrams

### Probability

Possibility Space (sample space)

Tree diagrams

Venn Diagrams

- Venn diagrams - introduction
- 3 set problems
- Notation and defining regions
- Probability in Venn diagrams
- P(AUB)

Summary (Independent, Dependent and Mutually Exclusive Events)

### Discrete random variables

Discrete random variables

- Probability distribution tables
- Cumulative distribution function F(X)
- Expected values E(X) and E(X
^{2}) - Variance, Var(X)
**Linear Combinations of discrete random variables**- Exam Questions

### The normal distribution

### Correlation and regression

### Exam Papers

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