Edexcel S2 June/may 2011 exam answers review
A factory produces components. Each component has a unique identity number and it is assumed that 2% of the components are faulty. On a particular day, a quality control manager wishes to take a...
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Edexcel S2 january 2011 exam answers review
A disease occurs in 3% of a population. State any assumptions that are required to model the number of people with the disease in a random sample of size n as a binomial distribution.(2)...
Edexcel S2 June 2013 exam answers review
A bag contains a large number of 1p, 2p and 5p coins. 50% are 1p coins 20% are 2p coins 30% are 5p coins A random sample of 3 coins is chosen from the...
Edexcel S2 january 2012 exam answers review
The time in minutes that Elaine takes to checkout at her local supermarket follows a continuous uniform distribution defined over the interval [3, 9]. Find Elaine’s expected checkout time,(1) the variance of the time...
Edexcel S2 january 2013 exam answers review
Write down the conditions under which the Poisson distribution can be used as an approximation to the binomial distribution.(2) The probability of any one letter being delivered to the wrong house is 0.01 On...
Probability density mean and distribution
This article is a continuation from the previous random variables article. This article covers mean and variance of a probability density function. First we shall discuss a few key points before actually looking at...
Cumulative distribution function
This article is a continuation from the previous continuous random variables article. It may be a good idea to read through it before attempting this section. This article covers cumulative distribution for continuous random...
Cumulative binomial distribution tables
This section is a continuation from the previous binomial distribution article. It may be a good idea to go through it before attempting this article. This article explores using tables of the cumulative distribution...
When is to use binomial distribution
This article is a continuation from the previous Binomial distribution article. It may be a good idea to go through that article before attempting this article. This article explores the conditions when a binomial...
Finding probabilities using binomial theorem
This article is a continuation from the previous binomial distribution article. It may be a good idea to go through it before attempting this section. This section explores how to use binomial theorem to...