Binomial Distribution in A-Level Mathematics
This page delves into the binomial distribution, a key topic in Statistical distributions A-level Maths Edexcel. It provides a comprehensive overview of binomial probability calculations and their applications.
The page begins by introducing the notation for binomial distribution: X ~ Bn,p, where n is the number of trials and p is the probability of success.
Definition: The binomial distribution models the number of successes in a fixed number of independent trials, each with the same probability of success.
Students are guided through calculating probabilities for specific outcomes and ranges using the binomial probability formula:
PX=r = nCr * p^r * 1−p^n−r
Example: For X ~ B12,1/4, the probability of exactly 2 successes is calculated using 12C2 * 1/4^2 * 3/4^10.
The page also covers cumulative binomial probabilities, teaching students how to find probabilities for X being less than or equal to a certain value.
Highlight: Understanding how to use calculator functions for binomial probabilities is crucial for efficiently solving Edexcel A-level maths probability distribution questions.
Practical applications of the binomial distribution are explored through real-world scenarios, such as rolling a biased die or surveying radio listeners.
Vocabulary: Cumulative binomial probability - the probability that a binomial random variable is less than or equal to a specified value.