For any discrete random variable, the sum of all probabilities is: [...]\text{[...]}[...].
∑P(X=x)=100\sum P(X=x)=100∑P(X=x)=100
∑P(X=x)=1\sum P(X=x)=1∑P(X=x)=1
∑P(X=x)=0\sum P(X=x)=0∑P(X=x)=0
∑P(X=x)=n\sum P(X=x)=n∑P(X=x)=n
Flashcards for Edexcel AS Level Maths Statistical Distributions, covering the key formulae, methods and definitions you need to recall for Paper 1 and Paper 2. 23 cards drawn from Probability Distributions, The Binomial Distribution, and Cumulative Probabilities, matched to the Edexcel AS Level Maths (8MA0) specification.